[android-developers] Alert dailog --.view.WindowLeaked

I want to dispaly alert dailog in asyn task( in post method..) am getting the alert dailog but in log it show the errorandroid.view.WindowLeaked: Activity com.androi.LoginScreen has leaked window 

protected void onPostExecute(Void result) {

// TODO Auto-generated method stub

super.onPostExecute(result);

// ACTIVITY_INSTANCE.dismissDialog(PROGRESS_DIALOG);

if (error == 100) {

AlertDialog.Builder builder = new AlertDialog.Builder(Login.this);

builder.setTitle("Login Details");

builder.setMessage("INvalid Login details")

 

      .setCancelable(false)

      .setPositiveButton("Yes", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int id) {

// TODO Auto-generated method stub

}

         

      });

AlertDialog alert = builder.create();

// AlertDialog dialog=alert.create();

alert.show();

}

03-21 18:29:57.888: INFO/ActivityManager(59): Starting activity: Intent { cmp=com.androi/.YearDetails }

03-21 18:29:58.258: DEBUG/AndroidRuntime(292): --- registering native functions ---

03-21 18:29:59.038: INFO/ActivityManager(59): Displayed activity com.androi/.YearDetails: 1082 ms (total 1082 ms)

03-21 18:29:59.608: ERROR/WindowManager(282): Activity com.androi.LoginScreen has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44e78238 that was originally added here

03-21 18:29:59.608: ERROR/WindowManager(282): android.view.WindowLeaked: Activity com.androi.LoginScreen has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44e78238 that was originally added here

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.view.ViewRoot.<init>(ViewRoot.java:247)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.view.Window$LocalWindowManager.addView(Window.java:424)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.app.Dialog.show(Dialog.java:241)

03-21 18:29:59.608: ERROR/WindowManager(282):     at com.androi.LoginScreen$Task.onPostExecute(LoginScreen.java:327)

03-21 18:29:59.608: ERROR/WindowManager(282):     at com.androi.LoginScreen$Task.onPostExecute(LoginScreen.java:1)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.os.AsyncTask.finish(AsyncTask.java:417)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.os.AsyncTask.access$300(AsyncTask.java:127)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.os.Handler.dispatchMessage(Handler.java:99)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.os.Looper.loop(Looper.java:123)

03-21 18:29:59.608: ERROR/WindowManager(282):     at android.app.ActivityThread.main(ActivityThread.java:4627)

03-21 18:29:59.608: ERROR/WindowManager(282):     at java.lang.reflect.Method.invokeNative(Native Method)

03-21 18:29:59.608: ERROR/WindowManager(282):     at java.lang.reflect.Method.invoke(Method.java:521)

03-21 18:29:59.608: ERROR/WindowManager(282):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)

03-21 18:29:59.608: ERROR/WindowManager(282):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

03-21 18:29:59.608: ERROR/WindowManager(282):     at dalvik.system.NativeStart.main(Native Method)

03-21 18:30:00.188: DEBUG/dalvikvm(282): GC_FOR_MALLOC freed 2945 objects / 206072 bytes in 247ms

03-21 18:30:00.878: DEBUG/dalvikvm(220): GC_EXPLICIT freed 497 objects / 28456 bytes in 162ms

03-21 18:30:01.237: DEBUG/PackageParser(59): Scanning package: /data/app/vmdl30936.tmp

03-21 18:30:01.258: INFO/PackageParser(59): com.androi: compat added android.permission.WRITE_EXTERNAL_STORAGE android.permission.READ_PHONE_STATE

03-21 18:30:01.518: INFO/PackageManager(59): Removing non-system package:com.androi

03-21 18:30:01.518: INFO/ActivityManager(59): Force stopping package com.androi uid=10036

03-21 18:30:01.578: INFO/Process(59): Sending signal. PID: 282 SIG: 9

03-21 18:30:01.578: INFO/ActivityManager(59):   Force finishing activity HistoryRecord{45067938 com.androi/.SecondScreen}

03-21 18:30:01.648: INFO/UsageStats(59): Unexpected resume of com.android.launcher while already resumed in com.androi

03-21 18:30:01.847: INFO/WindowManager(59): WIN DEATH: Window{44f7f068 com.androi/com.androi.SecondScreen paused=true}

03-21 18:30:01.847: INFO/WindowManager(59): WIN DEATH: Window{44fd0210 com.androi/com.androi.YearDetails paused=false}

03-21 18:30:01.847: INFO/WindowManager(59): WIN DEATH: Window{450c1f70 com.androi/com.androi.YearDetails paused=false}

03-21 18:30:01.987: DEBUG/PackageManager(59): Scanning package com.androi

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