Execution failed for task ‘:app:javaPreCompileDebug‘.

We do not consider using Alibaba's mirrors here, we all use Google's.

Check your grable version.

 

 If yours is 4 and above, use:
 

google()
jcenter()

Otherwise use

maven {
  url 'https://maven.google.com'
}
jcenter()

! ! ! It should be noted that google.com must be placed above jcenter(), and jcenter must be placed on the last line.