The new android studio (4.2) no longer supports the old one

com.android.tools.build:gradle:2.3.3

Now, some methods and classes will not be found.

Solution:

Go to build.gradle and replace this classpath with the latest version. It is best to also get the latest version of gradle and gradle wrapper. for example:

dependencies {
    classpath 'com.android.tools.build:gradle:4.2.1'
     
 
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

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