I'm recently struggling with a problem where my Build Variants is not working properly. I can't select variants, there is just a ----- on the selection row.

I have tried to:
My buildConfig Gradle looks like:
  buildTypes {
    debug {
        minifyEnabled false
        resValue "string", "ADMOB_APP_ID", "\"${keystoreProperties["debugAdmobApiKey"]}\""
        resValue "string", "INSTERSTIAL_AD_ID", "\"${keystoreProperties["debugInterstialAdKey"]}\""
    }
    release {
        minifyEnabled true
        shrinkResources true
        proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        resValue "string", "ADMOB_APP_ID", "\"${keystoreProperties["releaseAdmobApiKey"]}\""
        resValue "string", "INSTERSTIAL_AD_ID", "\"${keystoreProperties["releaseInterstialAdKey"]}\""
    }
}
What could be the problem?
Try to sync your project with the Gradle files via
File -> Sync Project with Gradle Files
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