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

for me it was an additional classpath line for example :

classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'
classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'

so i was deleting the first

classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'

and the issue solved