So, just updated to Android Studio 1.4 Beta 4 and having trouble building a release build. I can build a debug build fine. This is the error I get:
ExternalS
I had the same problem with Android Studio 1.4 Build on September 28, 2015 What I did was :
Started a build on the main gradle script - that created a run configuration in the menu.
Edited the run configuration by adding ":app:assembleRelease" on the script parameters row. and started it.
The gradle build showed me that I had missing translations in the main strings.xml file.
After fixing this. Generate Signed APK finished without problem.