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Exception "java.lang.ClassNotFoundException: Didn't find class..." on Android 4.4.2

When I try to run my existing application (using Android Studio 3.1.3) on Android 4.4.2 it is not running and showing this error:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: my.project, PID: 9428
java.lang.NoClassDefFoundError: uz/uno/models/Transaction
at java.lang.Class.getDeclaredFields(Native Method)
at java.lang.Class.getDeclaredFields(Class.java:610)
at com.activeandroid.util.ReflectionUtils.getDeclaredColumnFields(ReflectionUtils.java:73)
at com.activeandroid.TableInfo.<init>(TableInfo.java:66)
at com.activeandroid.ModelInfo.loadModelFromMetaData(ModelInfo.java:101)
at com.activeandroid.ModelInfo.<init>(ModelInfo.java:61)
at com.activeandroid.Cache.initialize(Cache.java:66)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:44)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:34)
at com.activeandroid.content.ContentProvider.onCreate(ContentProvider.java:39)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1591)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1562)
at android.app.ActivityThread.installProvider(ActivityThread.java:5233)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:4827)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4710)
at android.app.ActivityThread.access$1600(ActivityThread.java:174)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1367)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5593)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "my.project.models.Transaction" on path: DexPathList[[zip file "/data/app/my.project-5.apk"],nativeLibraryDirectories=[/data/app-lib/my.project-5, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
Pay attention to the exception:
Caused by: java.lang.ClassNotFoundException: Didn't find class "my.project.models.Transaction" on path: DexPathList[[zip file "/data/app/my.project-5.apk"],nativeLibraryDirectories=[/data/app-lib/my.project-5, /vendor/lib, /system/lib]]
I found out that everytime when I try to run and it crashes the number in the exception increases my.project-5. (First time it was my.project-1, then my.project-2, and so on).
What is the problem and how can I fix this error?
Note: This error is also occuring on android 4.3. However, for android 5.0 and above it is working well.
Edit: Answer
After doing some research, I found the answer here:
NoClassDefFoundError with Android Studio on Android 4
https://developer.android.com/studio/build/multidex

I think you have a conflict with some code that requires at least android 5.0 but you are running in 4.4.2.
See the documentation here: https://developer.android.com/training/basics/supporting-devices/platforms and here: https://developer.android.com/guide/practices/compatibility
Post the code so we can help you better.

Android NoClassDefFoundError on android 4.4.2

When I try to run my app on Android 4.4.2 it is giving me this error:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: my.package, PID: 24775
java.lang.NoClassDefFoundError: my/package/models/Transaction
at java.lang.Class.getDeclaredFields(Native Method)
at java.lang.Class.getDeclaredFields(Class.java:610)
at com.activeandroid.util.ReflectionUtils.getDeclaredColumnFields(ReflectionUtils.java:73)
at com.activeandroid.TableInfo.<init>(TableInfo.java:66)
at com.activeandroid.ModelInfo.loadModelFromMetaData(ModelInfo.java:101)
at com.activeandroid.ModelInfo.<init>(ModelInfo.java:61)
at com.activeandroid.Cache.initialize(Cache.java:66)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:44)
at com.activeandroid.ActiveAndroid.initialize(ActiveAndroid.java:34)
at com.activeandroid.content.ContentProvider.onCreate(ContentProvider.java:39)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1591)
at android.content.ContentProvider.attachInfo(ContentProvider.java:1562)
at android.app.ActivityThread.installProvider(ActivityThread.java:5233)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:4827)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4710)
at android.app.ActivityThread.access$1600(ActivityThread.java:174)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1367)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5593)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "my.package.models.Transaction" on path: DexPathList[[zip file "/data/app/my.package-1.apk"],nativeLibraryDirectories=[/data/app-lib/my.package-1, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
However, for Android 5.0 and above it is working without any errors.
What is the reason and how can I fix it?
Note: there is a similar question on StackOverflow but it does not have any answers.

You can find the answer for this question here:
NoClassDefFoundError with Android Studio on Android 4
https://developer.android.com/studio/build/multidex

Try this
Just go to disable Instant Run Go to
File -> Settings -> Build,Execution, Deployment -> Instant Run ->
Uncheck the checkbox for instant run
Run your app once.

Android didn't find application class crash

In Manifest I declared
<application
android:name=com.example.App>
When the app starts, sometimes this crash happens:
java.lang.RuntimeException: Unable to instantiate application com.example.App: java.lang.ClassNotFoundException: Didn't find class "com.example.App" on path: DexPathList[[zip file "/mnt/asec/com.example.myapp-1/pkg.apk"],nativeLibraryDirectories=[/mnt/asec/com.example.myapp-1/lib, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:516)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4514)
at android.app.ActivityThread.access$1500(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1381)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5299)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
at dalvik.system.NativeStart.main(Native Method)
Is it possible to fix it somehow?

This doesn't seems to be an app crash. This is just a verbose message raised when dalvik reinstall the apk.It won't occur on end-user's device.To fix it on your development machine, just clean and rebuild.

Error on SIMPLE ANDROID OCR

When I tried the Simple Android OCR (https://github.com/GautamGupta/Simple-Android-OCR) in ANDROID STUDIO it gave me a runtime error as shown in the picture. Can anyone help me with this?
![Runtime error occured when tried to run][2]
06-03 12:44:31.904 17051-17051/com.startup.vrvijay.liccamera E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.startup.vrvijay.liccamera, PID: 17051
android.util.SuperNotCalledException: Activity {com.startup.vrvijay.liccamera/com.startup.vrvijay.liccamera.MainActivity} did not call through to super.onCreate()
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2333)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2429)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5333)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)

You forgot to place:
super.onCreate(savedInstanceState);
right after your
protected void onCreate(Bundle savedInstanceState) {

Getting uknown error when using mupdf

I've tried to import mupdf to my app, but when I open it, i got some weird error and it force closes. Why? I really don't understand.
this is my logcat:
10-10 15:34:17.802 8657-8657/com.tproductions.Openit E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.tproductions.Openit, PID: 8657
java.lang.UnsatisfiedLinkError: Native method not found: com.artifex.mupdfdemo.MuPDFCore.openFile:(Ljava/lang/String;)J
at com.artifex.mupdfdemo.MuPDFCore.openFile(Native Method)
at com.artifex.mupdfdemo.MuPDFCore.<init>(MuPDFCore.java:68)
at com.artifex.mupdfdemo.MuPDFActivity.openFile(MuPDFActivity.java:204)
at com.artifex.mupdfdemo.MuPDFActivity.onCreate(MuPDFActivity.java:303)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5135)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at dalvik.system.NativeStart.main(Native Method)

It looks like something has gone wrong in the native build.
It's probably best to retry that; there are instructions here:
http://www.mupdf.com/doc/how-to-build-mupdf-for-android
and here:
http://git.ghostscript.com/?p=mupdf.git;a=blob_plain;f=platform/android/ReadMe.txt;hb=HEAD
It's probably best to use the git code from master - the latest is 1.6, versions prior to 1.5 are unlikely to build cleanly with the current NDKs.