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

Add buildToolsVersion to your build.gradle file this will solve your problem.

buildToolsVersion "27.0.1"

Gradle file code

 android{
          compileSdkVersion 27
          buildToolsVersion "27.0.1"
          useLibrary 'org.apache.http.legacy'
        }