Gradle project refresh failed after Android Studio update

Check the Gradle home path after the update to version 1.5. It should be ../gradle-2.8.

File -> Invalidate Caches / Restart -> Invalidate and Restart worked for me.

Most people do not read the comments so to summarize (Thanks to @Industrial-antidepressant and @wrecker):

As suggested in a bug ticket you should try the following:

1. Close Android Studio
2. go to android-studio/plugins/gradle/lib
3. Delete (or better move them somewhere to have a backup) all gradle-*-1.8 files
4. Start Android Studio again and rebuild/refresh.

It should work. Make sure to star the above bug ticket to get informed.

Little tip: Try the new compile setting Settings -> Compiler -> Gradle and activate the third in-process build for a speed up. Depending on your project setting you might want to select the first one as well. With that my project build time reduced to 2-4 seconds (before 20+ seconds).

I tried everything, nothing worked.then I tried the following steps and it worked

1. close Android studio

2. go to "My Documents"

3. delete the following folders a).android, b).androidstudio1.5, c).gradle

4. start Android studio and enjoy...

It seems stupid but works...