This manual will help you troubleshoot why a build failed on Zapp:
1) Login to Zapp
2) Locate the failing build and click on the "Build Status" button .
A dropdown menu shall open with the "Download Failure Log" error button.
* Note: Should you be an Internal Applicaster employee/user, you will have an additional option called "Go to Build", which enabled you to look at the build status within Circe CI (Click HERE for more information).
3) Download the Failure file, and then open it with a Document Editor / Sublime / etc...
Search at the bottom of the file, for a message that says "What went wrong" and/or "Unable to Satisfy the Current Implementation" and/or "Build failed with an exception".
FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:packageMobileGoogleZappRelease'. > Failed to read key applicaster from store "/home/circleci/Zapp-Android/dist.keystore": Keystore was tampered with, or password was incorrect
In this case, we can clearly see there is an issue with the Dist.Keysore, where it was tampered with or has an incorrect password.