When rebuild an APK using apktool, I run into this problem:
brut.androlib.AndrolibException: brut.common.BrutException: could not exec (exit code = 1):
Try this:
apktool b --use-aapt2 -o unsigned_apk.apk .\app-debug\
It works for me this time,
but this may not working for any APK for all the time.