Android Studio: Cannot resolve symbol AsyncTask - android

Android studio is driving me crazy with this error message! Everything was working fine until my PC crashed and ever since Android Studio is throwing compiler errors for my AsyncTaskClass. It's almost as if the android.os.AsyncTask import doesn't do anything all of a sudden. I'm running the latest build tools (25.0.1) and compiling with the latest API (v25). What can I do to fix this and get my AsyncTask working again?
EDIT: To give some background: I've cleaned and rebuilt a dozen times to no avail. I've also tried the solution here but I already had the proper build/API set. Very confused.

The solution was to open Android Studio and select File -> Invalidate Caches/Restart.

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Xamarin Forms: error in Droid project with Visual Studio

there are three day I'm trying to have a clear solution to start for each platform. Unfortunately, I'm very frustrating because I can't have that. Now in droid project there is a new kind of error:
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To fix the problem I tried to download and reinstall the Android Studio
but the error appeared again on the second start of the app.
Finally I found that my desktop shortcut had a wrong target file studio.exe, not studio64.exe.
I spent a couple weeks figuring this one out but as it turns out the issue was with my Java Home environment variable. I had mistakenly set jre1.8.etc as my home when it in fact needed to be the jdk1.8.0_101.
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Building work space, errors occurred during the build

I am using eclipse adt, it was running fine. Now from two days it is showing Building workspace has encountered a problem, errors occurred during the build. For the first time, I closed the eclipse and reopened it everything went fine, but today this trick is not working. I googled this, but in their questions this error is because of updating the sdk, but I did not updated anything still I am getting this error.. and in some site I found the solution as go to project properties->builders->uncheck the javascript validators, but there was no javascrript validator in the builders. So how to solve this?
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It worked for me.

Downgrading Android Studio cause unrecoverable error

I recently attempted to upgrade my version of Android Studio, Android build tools and the Android Gradle Plugin to 0.6.1, 19.1.0 and 0.11.1, respectively.
That turned out to be a mess. So much has changed, especially with the location of output files, that it made my project completely barf. So now I want to downgrade back to 0.5.9, when everything worked and was fine, but I can't.
I get the message:
Error:Unable to load class 'org.jetbrains.plugins.gradle.model.ExtIdeaCompilerOutput' This is an unexpected error. Please file a bug containing the idea.log file
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The same thing just happened to me. Clearing the IDE's cache solved the issue
In Android Studio
File > Invalidate caches / restart...
What finally solved this for me was uninstalling, via the instructions in this post,
How to completely uninstall Android Studio?
and then installing 0.5.9 from scratch.

android studio build error debug-unaligned.apk path not found

Last night I updated my android studio to 0.5.3 and since than i am getting this error message whenever I am trying to generate a signed-apk. It does not occur when I am just running the project over android studio.
I tried rebuilding, cleaning project, restarting android-studio, reimporting the project, no success. I am pretty desperate right now
EDIT: i found out that actually debug-unaligned is not generated... But why is that? And why do i need to generate it if i am just trying to sign the app
In 0.5.3, we tried to speed up the build process by not having it do a full build to an APK except when it needs to, but we missed some cases where it needs to.
You can follow progress in https://code.google.com/p/android/issues/detail?id=67948 but in the meantime you can work around it by running the assembleRelease task, either from the command line or from the Gradle tasks view:

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