How to compile back to apk?

Question

Android

I work with Virtouos Ten Studio.
Decompiled apk, changed only icons icon.png and screen.png.
Then I clicked Build All and apk
In the logs I got an error
Script.ExecuteScript Executing Myapp -> Sign file failed!
Script.ExecuteScript Failed module is essential, aborting script execution!
After that, the apk does not start.
Even just if you decompile and assemble back, the same thing happens!