如何消除这个错误？ java.lang.reflect.InitationTargetException [重复]

我添加了所有需要的权限

 PackageManager packageManager = context.getPackageManager();
    Class<?> [] c = new Class[2];
    c[0] = String.class;
    c[1] = IPackageDataObserver.class;
    try {

    Object cleardata = packageManager.getClass().getMethod("clearApplicationUserData", c);
       Object[] o = new Object[2];
       o[0] = String.valueOf("my.app.withdata");
       o[1] = new ClearApplicationDataObserver();

    ((Method)cleardata).invoke(packageManager, o);
  }
    catch(Exception e) {e.printStackTrace();
 }

02-02 16:08:26.629: W/System.err(709): java.lang.reflect.InvocationTargetException
02-02 16:08:26.678: W/System.err(709):  at java.lang.reflect.Method.invokeNative(Native Method)
02-02 16:08:26.738: W/System.err(709):  at java.lang.reflect.Method.invoke(Method.java:511)
02-02 16:08:26.738: W/System.err(709):  at f.c.v.ClearUserDataUsingInterfaceActivity.run1(ClearUserDataUsingInterfaceActivity.java:105)
02-02 16:08:26.778: W/System.err(709):  at f.c.v.ClearUserDataUsingInterfaceActivity$1.run(ClearUserDataUsingInterfaceActivity.java:52)
02-02 16:08:26.778: W/System.err(709):  at java.lang.Thread.run(Thread.java:856)
02-02 16:08:26.778: W/System.err(709): Caused by: java.lang.SecurityException: Neither user 10048 nor current process has android.permission.CLEAR_APP_USER_DATA.
02-02 16:08:26.778: W/System.err(709):  at android.os.Parcel.readException(Parcel.java:1327)
02-02 16:08:26.778: W/System.err(709):  at android.os.Parcel.readException(Parcel.java:1281)
02-02 16:08:26.808: W/System.err(709):  at android.content.pm.IPackageManager$Stub$Proxy.clearApplicationUserData(IPackageManager.java:2568)
02-02 16:08:26.808: W/System.err(709):  at android.app.ApplicationPackageManager.clearApplicationUserData(ApplicationPackageManager.java:1006)
02-02 16:08:26.808: W/System.err(709):  ... 5 more

nvocationTargetException 是由于系统无法调用 Activity 造成的，并且是因为 Activity 上存在另一个错误，请检查真正的问题是： java.lang.SecurityException: Both user 10048 Nor current process has android.permission.CLEAR_APP_USER_DATA。这是因为你需要在 android 清单文件中设置此权限。