我刚运行就报错。。 还没写什么东西呢

 java.lang.RuntimeException: Unable to instantiate application com.example.theopangmusic.MyApplication: java.lang.ClassNotFoundException: Didn't find class "com.example.theopangmusic.MyApplication" on path: DexPathList[[zip file "/data/app/com.example.theopangmusic-nmi3w8VqKM-TbI256ZJGUw==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.theopangmusic-nmi3w8VqKM-TbI256ZJGUw==/lib/x86, /system/lib]]