When I try to generate a signed APK, I found this issue :
10:58 Generate Signed APK: Errors while building APK. You can find the errors in the \'Messa
I think this version required updated libs and gradle. try to change to compileSdkVersion 27 and libaries as.
compileSdkVersion 27
implementation 'com.android.support:support-v4:27.1.0'
and gradle ver,
classpath 'com.android.tools.build:gradle:3.1.0'