title: FATAL EXCEPTION: main
body: <p>I am developing in app where I am using an activity in which I'm displaying a list view items page by page by using threading, When the user selects the item it will take the user to another activity.</p>
  
  <p>But Here some times when I click on list view item the app crashes. It says something in log cat but I am unable to understand it.</p>
  
  <p>Here is the Stack Trace:</p>
  
  <pre><code>06-24 16:26:44.320: ERROR/AndroidRuntime(4248): FATAL EXCEPTION: main
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248): android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@4073ef78 is not valid; is your activity running?
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.view.ViewRoot.setView(ViewRoot.java:527)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.view.Window$LocalWindowManager.addView(Window.java:424)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.app.Dialog.show(Dialog.java:241)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at com.usablenet.mobile.walgreen.app.util.ErrorAlertServiceImp.showErrorAlert(ErrorAlertServiceImp.java:86)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at com.usablenet.mobile.walgreen.pharmacy.PrescriptionList.showErrorCodeAlert(PrescriptionList.java:360)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at com.usablenet.mobile.walgreen.pharmacy.PrescriptionList.access$300(PrescriptionList.java:45)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at com.usablenet.mobile.walgreen.pharmacy.PrescriptionList$2.handleMessage(PrescriptionList.java:323)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.os.Handler.dispatchMessage(Handler.java:99)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.os.Looper.loop(Looper.java:130)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at android.app.ActivityThread.main(ActivityThread.java:3683)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at java.lang.reflect.Method.invokeNative(Native Method)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at java.lang.reflect.Method.invoke(Method.java:507)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  06-24 16:26:44.320: ERROR/AndroidRuntime(4248):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>Thanks,
  Balu.</p>