相关疑难解决方法(0)

我在设备上运行时遇到此错误.我一直在浏览这个问题,我很确定我没有提到的问题.我的两个活动都在AndroidManifest中声明,而intent过滤器就在那里.我没有任何库(除了v4支持库,但声明它不会改变问题).我想在我的清单代替carpedujourproductions.quickpronote.MainActivity通过.MainActivity,但仍然没有运气.我正在运行Android Studio 0.2.5,所以我找不到如何解决与Java Build Path/Order and Export相关的潜在问题

我忍不住注意到我的MainActivity图标在树的左上角有一个灰色的十字架.

logcat的:

E/AndroidRuntime: FATAL EXCEPTION: main
        java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{carpedujourproductions.quickpronote/carpedujourproductions.quickpronote.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "carpedujourproductions.quickpronote.MainActivity" on path: DexPathList[[zip file "/data/app/carpedujourproductions.quickpronote-2.apk"],nativeLibraryDirectories=[/data/app-lib/carpedujourproductions.quickpronote-2, /vendor/lib, /system/lib]]
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2157)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2281)
        at android.app.ActivityThread.access$600(ActivityThread.java:148)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1263)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:5124)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:525)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:110)
        at dalvik.system.NativeStart.main(Native Method)
        Caused by: java.lang.ClassNotFoundException: Didn't find class "carpedujourproductions.quickpronote.MainActivity" on path: DexPathList[[zip file "/data/app/carpedujourproductions.quickpronote-2.apk"],nativeLibraryDirectories=[/data/app-lib/carpedujourproductions.quickpronote-2, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
        at …