error: cannot find symbol MainActivity.FILENAME

[ghost]

When I build through $./gradlew cAT, it failed.

Minimal-Todo/app/src/androidTest/java/com/example/avjindersinghsekhon/minimaltodo/TestStoreRetrieveData.java:171: error: cannot find symbol
        return new StoreRetrieveData(context, MainActivity.FILENAME);
                                                          ^
  symbol:   variable FILENAME
  location: class MainActivity
1 error