我不明白这个错误：java.lang.RuntimeException

如何解决我不明白这个错误：java.lang.RuntimeException

我从我的 android 应用程序中收到此错误，但我不明白。

我没有写过下面的任何文件。我可以打开它们看看代码吗？

java.lang.RuntimeException: 
   at android.app.ActivityThread.performlaunchActivity (ActivityThread.java:3382)
   at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3521)
   at android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:83)
   at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
   at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
   at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2128)
   at android.os.Handler.dispatchMessage (Handler.java:107)
   at android.os.Looper.loop (Looper.java:214)
   at android.app.ActivityThread.main (ActivityThread.java:7711)
   at java.lang.reflect.Method.invoke (Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:516)
   at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:950)