Develop Reference

Android studio 2020.3.1(Windows 10) unable to start, internal error thrown

I just installed Android Studio 2020.3.1 Arctic Fox in Windows 10 and upon startup the following issue is being thrown:
Internal error. Please refer to https://code.google.com/p/android/issues
java.util.concurrent.CompletionException: org.picocontainer.PicoRegistrationException: Key io.flutter.settings.FlutterSettings duplicated
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:618)
at java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:628)
at java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:1996)
at com.intellij.idea.ApplicationLoader.registerAppComponents(ApplicationLoader.kt:91)
at com.intellij.idea.ApplicationLoader.executeInitAppInEdt(ApplicationLoader.kt:63)
at com.intellij.idea.ApplicationLoader.access$executeInitAppInEdt(ApplicationLoader.kt:1)
at com.intellij.idea.ApplicationLoader$initApplication$1$1.run(ApplicationLoader.kt:355)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: org.picocontainer.PicoRegistrationException: Key io.flutter.settings.FlutterSettings duplicated
at com.intellij.util.pico.DefaultPicoContainer.registerComponent(DefaultPicoContainer.java:119)
at com.intellij.serviceContainer.ComponentManagerImpl.registerServices(ComponentManagerImpl.kt:320)
at com.intellij.serviceContainer.ComponentManagerImpl.registerComponents(ComponentManagerImpl.kt:186)
at com.intellij.serviceContainer.ComponentManagerImpl.registerComponents(ComponentManagerImpl.kt:157)
at com.intellij.idea.ApplicationLoader$registerAppComponents$1.apply(ApplicationLoader.kt:93)
at com.intellij.idea.ApplicationLoader$registerAppComponents$1.apply(ApplicationLoader.kt)
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616)
... 20 more
-----
your JRE 11.0.9 +7-LTS amd64 (Oracle Corporation)
c:\Program Files\Java\jdk-11.0.9
I have followed solution Android Studio updated, cannot start now, internal error thrown but still I am facing the issue. Please help me to fix this issue. Thanks in Advance

Android studio : UnsupportedOperationException: Operation is not supported > for read-only collection

I use Android Studio 3.3.2
Each time I open my project a message appear : Indexing paused due to batch update.
An error is catch by the IDE :
java.lang.UnsupportedOperationException: Operation is not supported for read-only collection
at kotlin.collections.EmptyList.add(Collections.kt)
at com.android.tools.idea.gradle.run.MakeBeforeRunTaskProviderUtil.addBeforeRunTaskToConfig(MakeBeforeRunTaskProviderUtil.java:109)
at com.android.tools.idea.gradle.run.MakeBeforeRunTaskProviderUtil.fixConfigurationsMissingBeforeRunTask(MakeBeforeRunTaskProviderUtil.java:65)
at com.android.tools.idea.gradle.project.FixAndroidRunConfigurationsAction.actionPerformed(FixAndroidRunConfigurationsAction.java:75)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:255)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:272)
at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.lambda$null$2(ActionManagerImpl.java:1356)
at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:195)
at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.lambda$tryToExecuteNow$3(ActionManagerImpl.java:1313)
at com.intellij.openapi.wm.impl.FocusManagerImpl.lambda$doWhenFocusSettlesDown$2(FocusManagerImpl.java:199)
at com.intellij.util.ui.UIUtil.invokeLaterIfNeeded(UIUtil.java:3094)
at com.intellij.ide.IdeEventQueue.ifFocusEventsInTheQueue(IdeEventQueue.java:189)
at com.intellij.ide.IdeEventQueue.executeWhenAllFocusEventsLeftTheQueue(IdeEventQueue.java:138)
at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:190)
at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:196)
at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.doWhenFocusSettlesDown(IdeFocusManagerImpl.java:63)
at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.tryToExecuteNow(ActionManagerImpl.java:1312)
at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.lambda$tryToExecute$1(ActionManagerImpl.java:1297)
at com.intellij.openapi.actionSystem.impl.ActionManagerImpl.tryToExecute(ActionManagerImpl.java:1300)
at com.android.tools.idea.gradle.project.FixAndroidRunConfigurationsAction.executeAction(FixAndroidRunConfigurationsAction.java:99)
at com.android.tools.idea.gradle.project.FixAndroidRunConfigurationsAction.perform(FixAndroidRunConfigurationsAction.java:62)
at com.android.tools.idea.gradle.project.RunConfigurationChecker.lambda$ensureRunConfigsInvokeBuild$0(RunConfigurationChecker.java:70)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:447)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:431)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:415)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:817)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:758)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:394)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
I must go to File>Invalid cache/restart to solve the problem.
Anybody know how to fix it with invalid cache?

Try to re-import your project with the new Android studio version.
Also try to invalidate cache and restart.
File > Invalidate Cache & Restart > Just Restart
If this solution doesn't work, try to just press the play button in the right of the message. It happened to me a lot of times.

Android Studio error while opening AVD manager

I'm getting this error all the time:
java.lang.IllegalArgumentException: Argument for #NotNull parameter 'project' of com/android/tools/idea/avdmanager/AccelerationErrorNotificationPanel.<init> must not be null
at com.android.tools.idea.avdmanager.AccelerationErrorNotificationPanel.$$$reportNull$$$0(AccelerationErrorNotificationPanel.java)
at com.android.tools.idea.avdmanager.AccelerationErrorNotificationPanel.<init>(AccelerationErrorNotificationPanel.java)
at com.android.tools.idea.avdmanager.AvdDisplayList.refreshErrorCheck(AvdDisplayList.java:517)
at com.android.tools.idea.avdmanager.AvdDisplayList.refreshAvds(AvdDisplayList.java:218)
at com.android.tools.idea.avdmanager.AvdDisplayList.<init>(AvdDisplayList.java:175)
at com.android.tools.idea.avdmanager.AvdListDialog.<init>(AvdListDialog.java:43)
at org.jetbrains.android.actions.RunAndroidAvdManagerAction.openAvdManager(RunAndroidAvdManagerAction.java:55)
at org.jetbrains.android.actions.RunAndroidAvdManagerAction.actionPerformed(RunAndroidAvdManagerAction.java:48)
at com.intellij.openapi.wm.impl.welcomeScreen.FlatWelcomeFrame$FlatWelcomeScreen$IconsFreeActionGroup$1.actionPerformed(FlatWelcomeFrame.java:742)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:255)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:272)
at com.intellij.ui.popup.ActionPopupStep.performAction(ActionPopupStep.java:203)
at com.intellij.ui.popup.ActionPopupStep.performAction(ActionPopupStep.java:191)
at com.intellij.ui.popup.ActionPopupStep.lambda$onChosen$2(ActionPopupStep.java:185)
at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:195)
at com.intellij.ui.popup.AbstractPopup.lambda$dispose$8(AbstractPopup.java:1417)
at com.intellij.util.ui.UIUtil.invokeLaterIfNeeded(UIUtil.java:3094)
at com.intellij.ide.IdeEventQueue.ifFocusEventsInTheQueue(IdeEventQueue.java:189)
at com.intellij.ide.IdeEventQueue.executeWhenAllFocusEventsLeftTheQueue(IdeEventQueue.java:138)
at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:190)
at com.intellij.ui.popup.AbstractPopup.dispose(AbstractPopup.java:1411)
at com.intellij.ui.popup.WizardPopup.dispose(WizardPopup.java:160)
at com.intellij.ui.popup.list.ListPopupImpl.dispose(ListPopupImpl.java:307)
at com.intellij.ui.popup.PopupFactoryImpl$ActionGroupPopup.dispose(PopupFactoryImpl.java:289)
at com.intellij.openapi.util.Disposer$1.execute(Disposer.java:48)
at com.intellij.openapi.util.Disposer$1.execute(Disposer.java:44)
at com.intellij.openapi.util.objectTree.ObjectNode$1.execute(ObjectNode.java:138)
at com.intellij.openapi.util.objectTree.ObjectNode$1.execute(ObjectNode.java:107)
at com.intellij.openapi.util.objectTree.ObjectTree.executeActionWithRecursiveGuard(ObjectTree.java:182)
at com.intellij.openapi.util.objectTree.ObjectNode.execute(ObjectNode.java:107)
at com.intellij.openapi.util.objectTree.ObjectTree.executeAll(ObjectTree.java:151)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:129)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:125)
at com.intellij.ui.popup.WizardPopup.disposeAllParents(WizardPopup.java:263)
at com.intellij.ui.popup.list.ListPopupImpl.handleNextStep(ListPopupImpl.java:442)
at com.intellij.ui.popup.list.ListPopupImpl._handleSelect(ListPopupImpl.java:396)
at com.intellij.ui.popup.list.ListPopupImpl.handleSelect(ListPopupImpl.java:342)
at com.intellij.ui.popup.PopupFactoryImpl$ActionGroupPopup.handleSelect(PopupFactoryImpl.java:309)
at com.intellij.ui.popup.list.ListPopupImpl$MyMouseListener.mouseReleased(ListPopupImpl.java:501)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
at java.awt.Component.processMouseEvent(Component.java:6548)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3325)
at com.intellij.ui.popup.list.ListPopupImpl$MyList.processMouseEvent(ListPopupImpl.java:552)
at java.awt.Component.processEvent(Component.java:6313)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4903)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4725)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:737)
at java.awt.EventQueue$4.run(EventQueue.java:735)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:817)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:754)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:394)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
I tried to delete android files from Home, also avd folder from Android folder but nothing helps. I can't find many cases with this error on the internet. Maybe I need to install something else to make it work.
I followed this tutorial and React Native Getting started tutorial

The solution found in https://issuetracker.google.com/issues/128271323 (Comments 8 and 14):
Install support to KVM virtualization and set the proper user permissions.
Use the following commands:
sudo apt-get install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils
sudo usermod -aG kvm $USER
And then, reboot.

I also face same issue. And it was fixed when I update the Android Studio to 3.4

New AndroidStudio Update gives error and does not Work

I have updated my android studio. After the update it gives me the following message (same occur when the internet is turned off):
Internal Error. Please report to https://code.google.com/p/android/issues
java.lang.ExceptionInInitializerError
at com.intellij.openapi.vfs.LocalFileSystem.getInstance(LocalFileSystem.java:41)
at com.intellij.configurationStore.ApplicationStoreImpl.setPath(ApplicationStoreImpl.kt:50)
at com.intellij.openapi.application.impl.ApplicationImpl$10.run(ApplicationImpl.java:480)
at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:101)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:458)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:450)
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:197)
at com.intellij.idea.MainImpl$1$1$1.run(MainImpl.java:52)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: com.intellij.ide.plugins.PluginManager$StartupAbortedException: Fatal error initializing 'com.intellij.openapi.vfs.newvfs.ManagingFS'
at com.intellij.ide.plugins.PluginManager.handleComponentError(PluginManager.java:256)
at com.intellij.openapi.components.impl.PlatformComponentManagerImpl.handleInitComponentError(PlatformComponentManagerImpl.java:43)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:540)
at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:246)
at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:212)
at org.picocontainer.defaults.BasicComponentParameter.resolveInstance(BasicComponentParameter.java:77)
at org.picocontainer.defaults.ComponentParameter.resolveInstance(ComponentParameter.java:114)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getConstructorArguments(ConstructorInjectionComponentAdapter.java:257)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:217)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:53)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:248)
at com.intellij.util.pico.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:59)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:499)
at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:246)
at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:212)
at org.picocontainer.defaults.CollectionComponentParameter.getArrayInstance(CollectionComponentParameter.java:268)
at org.picocontainer.defaults.CollectionComponentParameter.resolveInstance(CollectionComponentParameter.java:127)
at org.picocontainer.defaults.ComponentParameter.resolveInstance(ComponentParameter.java:116)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getConstructorArguments(ConstructorInjectionComponentAdapter.java:257)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:217)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:53)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:248)
at com.intellij.util.pico.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:59)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:499)
at com.intellij.openapi.components.impl.ComponentManagerImpl.getComponent(ComponentManagerImpl.java:184)
at com.intellij.openapi.vfs.VirtualFileManager.getInstance(VirtualFileManager.java:51)
at com.intellij.openapi.vfs.LocalFileSystem$LocalFileSystemHolder.<clinit>(LocalFileSystem.java:37)
... 23 more
Caused by: java.lang.NoClassDefFoundError: jsr166e/extra/SequenceLock
at com.intellij.util.io.PagedFileStorage$StorageLock.<init>(PagedFileStorage.java:489)
at com.intellij.util.io.PagedFileStorage$StorageLock.<init>(PagedFileStorage.java:499)
at com.intellij.util.io.PagedFileStorage.<clinit>(PagedFileStorage.java:89)
at com.intellij.util.io.PagedFileStorage$StorageLockContext.<init>(PagedFileStorage.java:798)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecords$DbConnection.init(FSRecords.java:286)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecords$DbConnection.connect(FSRecords.java:187)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecords.connect(FSRecords.java:576)
at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.initComponent(PersistentFSImpl.java:87)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:522)
... 47 more
Caused by: java.lang.ClassNotFoundException: jsr166e.extra.SequenceLock
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:207)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 56 more
Do you know how to fix it? I did update Java and restart the computer many times.
Cheers for your help!

Plugins may make some issues after updating Android Studio to 2.3.
Just try to disable the plugins that reports any error when you are opening the Studio. Then restart the Android studio.
This worked for me. I had similar issue and I checked stack traces of studio and found that the issue was due to some error in Firebase plugin after Android Studio update. I'm not even using firebase in current project so I don't know how that makes a problem. I just disable firebase plugin and then now my device is showing in the Select Deployment Target window.

Nullpointer on new activity wizard

I'm studying Android through the Udacity. I'm on the Intents Lesson, "Exercise: Create an Activity" and one of the part of the Lesson is to create a new Activity using the wizard of Android Studio.
What happens is: I go to the New > Activity > Empty Activty and then the ugly Null Pointer appears.
"Exception in plugin Android Support. Moments ago. Ocurred 5 times since the last clear. Unread. Disable plugin".
What I've already tried:
Changing buildToolsVersion
Installing Android Studio 2.3 Beta (I'm on the latest stable version: 2.2)
Invalidate Caches/Restart
Importing another project
Checked my JAVA_HOME (1.8.0_92-b14)
Reported the problem to Google
Disabled the plugin (when I did that, showed a lot of errors, so I rolled back the change)
None of these solved my problem. Can anyone help me?
The stacktrace:
null
java.lang.NullPointerException
at com.android.tools.idea.actions.NewAndroidComponentAction.actionPerformed(NewAndroidComponentAction.java:134)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:191)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter$1.run(ActionMenuItem.java:312)
at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:958)
at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:282)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:110)
at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:513)
at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:45)
at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:533)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:857)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:654)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:386)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)