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所有编码完成之后，运行错误，跑不起来，有没有大神帮我看看，现在的错误我贴在下面

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{it.example.text/it.example.text.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "it.example.text.MainActivity" on path: DexPathList[[zip file "/data/app/it.example.text-1.apk"],nativeLibraryDirectories=[/data/app-lib/it.example.text-1, /vendor/lib, /system/lib]]

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2259)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2384)

at android.app.ActivityThread.access$800(ActivityThread.java:154)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)

at android.os.Handler.dispatchMessage(Handler.java:110)

at android.os.Looper.loop(Looper.java:193)

at android.app.ActivityThread.main(ActivityThread.java:5300)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:515)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.ClassNotFoundException: Didn't find class "it.example.text.MainActivity" on path: DexPathList[[zip file "/data/app/it.example.text-1.apk"],nativeLibraryDirectories=[/data/app-lib/it.example.text-1, /vendor/lib, /system/lib]]

at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

at java.lang.ClassLoader.loadClass(ClassLoader.java:497)

at java.lang.ClassLoader.loadClass(ClassLoader.java:457)

at android.app.Instrumentation.newActivity(Instrumentation.java:1061)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2250)

... 11 more