I am getting a red variable error in my Android Studio

Question

Error:

Execution failed for task ':app:processDebugResources'.

com.android.ide.common.process.ProcessException: Failed to execute aapt

Below screenshot

Answer 1

It is usually Gradle version issues. If latest Gradle also does not work, make sure your application goes through Rebuilding/Clean project process. Sometimes amending the Gradle with right version doesn't work because of old cache.

Answer 2

In Android studio:
Build--->Clean Project or try Tools-->Android-->Sync Project with Gradle Files.
If this doesn't work look for errors in the messages box.

Answer 3

It seems that the problem is in the theme you picked. Go to values--->styles folder, and change your Apptheme parent to ActionBarThemeOverlay. Then find your AppTheme in the theme picker and choose it.

Answer 4

If you are using android studio, you have following things to be clear on::

1. Invalidate Cache
2. Clean and Rebuild Project (involves Syncing)
3. Missing SDK for the platform you are using

Invalidate Cach

File > Invalidate Cache / Restart

Clean and Rebuild Project

a. Build > Clean Project b. Build > Rebuild Project

Missing SDK

• Tools > Android > SDK Manager
• Launch Standalone SDK Manager
• Check the Android SDK platform you want to install and use and Install packages

Do the above in order, I guess your problem should be fixed.

PS Update Android Studio if the problem persists.