If I run application , I am suddenly getting this error , what is the problem?

Question

Multiple dex files define Landroid/support/v4/app/INotificationSideChannel$Stub(error)

Answer 1

put this in your gradle configuration

multiDexEnabled true

Answer 2

Enable multiDex inside defaultConfig, or in specific build

 defaultConfig {
    ...

    multiDexEnabled true

}

And add the following dependency if you are using androidx

dependencies {
def multidex_version = "2.0.1"
implementation 'androidx.multidex:multidex:$multidex_version'}

Or the following support library if you are not using androidx

dependencies {

implementation 'com.android.support:multidex:1.0.3'

}

The detailed information and reference given in the following documentation