flutter android studio app unfortunately app has stopped

  android, android-studio, flutter, ios, sdk

iam a flutter beginer i face this problem and really im tried with and i didn’t find the solution, the apk builded successfully on android studio and installed on my phone but when i try to open it always i face this problem, kindly help me to solve this problem

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.test.beauty/com.test.beauty.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.test.beauty.MainActivity" on path: DexPathList[[zip file "/data/app/~~vVpGIeyV47V4c3-Hh5r9Wg==

Source: Android Questions