Error:Cause: buildToolsVersion is not specified

Question

I create a simple project and then I right-click on the project and then I use the make mudole app option. Now I have two build.gradle folders: 1-

Answer 1

in file... build.gradle(Project: XXX):

repositories{
     //put pluging repository here
     //e.g.:
     mavenCentral()
}
dependencies{
     //classpath to plugin here
     classpath 'com.XXXX.xXXxxXX.XXXX' 
}

in file.... build.gradle(Module: app)

//add on top:
apply plugin: 'com.YOUR.PLUGIN.XXX'