Flutter app rub debug

import androidx.multidex.MultiDex;
^
/Users/mansureminkaya/Desktop/flutter-crypto-app/android/app/src/main/java/io/flutter/app/FlutterMultiDexApplication.java:18: error: cannot find symbol
MultiDex.install(this);
^
symbol: variable MultiDex
location: class FlutterMultiDexApplication