Unable to start component info DatePicker
<p>I am working with Tabs and also using multiple activities with single Tab. 
i am facing a problem i.e when i go from parent class to child class that class has datepicker  in it and click on button that shows dialogue of date from where date can b selected. But when i click on that button (that triggers the date dialogue) my application crashes 
when the following 
"Unable to Start component info"
need help to resolve this </p>

<p>here is subactivity code </p>

<pre><code>import java.util.Calendar;

import android.app.Activity;

import android.app.DatePickerDialog;

import android.app.Dialog;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.DatePicker;

import android.widget.TextView;

public class PlaceOrder extends Activity {

private TextView tvDisplayDate,personName,Cname,cAdrress;

private DatePicker dpResult;

private Button btnChangeDate;

Button cancel;

private int year;

private int month;

private int day;


static final int DATE_DIALOG_ID = 0;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.placeorder);

personName=(TextView)findViewById(R.id.firstName);

Cname=(TextView)findViewById(R.id.Cname);

cAdrress=(TextView)findViewById(R.id.CAddname);

personName.setText(AccountInfo.fnameNlName);

Cname.setText(AccountInfo.cName);

cAdrress.setText(AccountInfo.cAdd);

setCurrentDateOnView();

addListenerOnButton();

cancel=(Button)findViewById(R.id.Cancel);

cancel.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if(FastPkgMainActivity.fastPackge==1) 

{

Intent fastPkgQuote = new Intent(v.getContext(), FastPkgQuote.class);


StringBuffer urlString = new StringBuffer();

FastPkgQuote parentActivity = (FastPkgQuote)getParent();

parentActivity.replaceContentView("fastpkg1", fastPkgQuote);


}

else if(FastPkgMainActivity.fastPackge==2)

{

Intent fastpkgQuoteNew = new Intent(v.getContext(), FastPkgQuoteNew.class);

StringBuffer urlString = new StringBuffer();

FastPkgQuoteNew parentActivity = (FastPkgQuoteNew)getParent();

parentActivity.replaceContentView1("fastPkg2", fastpkgQuoteNew);


}


}

});

}



public void setCurrentDateOnView() {

tvDisplayDate = (TextView) findViewById(R.id.tvDate);

dpResult = (DatePicker) findViewById(R.id.dpResult);

dpResult.setVisibility(View.INVISIBLE);

final Calendar c = Calendar.getInstance();

year = c.get(Calendar.YEAR);

month = c.get(Calendar.MONTH);

day = c.get(Calendar.DAY_OF_MONTH);

tvDisplayDate.setText(new StringBuilder()

.append(month + 1).append("-").append(day).append("-").append(year).append(" "));

dpResult.init(year, month, day, null);

}

public void addListenerOnButton() {

btnChangeDate = (Button) findViewById(R.id.btnChangeDate);

btnChangeDate.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

showDialog(DATE_DIALOG_ID);

}

});

}

@Override

public  Dialog onCreateDialog(int id) {

switch (id) {

case DATE_DIALOG_ID:


return new DatePickerDialog(this, datePickerListener, year, month,day);

}

return null;

}

public  DatePickerDialog.OnDateSetListener datePickerListener = new 

DatePickerDialog.OnDateSetListener() {



public void onDateSet(DatePicker view, int selectedYear,int selectedMonth, int selectedDay) 

{

year = selectedYear;

month = selectedMonth;

day = selectedDay;



tvDisplayDate.setText(new StringBuilder().append(month + 1).append("-

").append(day).append("-").append(year).append(" "));

            // set selected date into datepicker also

            dpResult.init(year, month, day, null);

        }
    };

}
</code></pre>

<p>here is logcat result </p>

<pre><code> FATAL EXCEPTION: main

android.view.WindowManager$BadTokenException: 

Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44ef0838 

is not valid; is your activity running?


android.view.ViewRoot.setView(ViewRoot.java:505)

04-20 15:50:06.703: E/AndroidRuntime(323):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.view.Window$LocalWindowManager.addView(Window.java:424)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.app.Dialog.show(Dialog.java:241)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.app.DatePickerDialog.show(DatePickerDialog.java:129)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.app.Activity.showDialog(Activity.java:2556)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.app.Activity.showDialog(Activity.java:2514)
04-20 15:50:06.703: E/AndroidRuntime(323):  at corrculator.fastPkg.PlaceOrder$3.onClick(PlaceOrder.java:108)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.view.View.performClick(View.java:2408)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.view.View$PerformClick.run(View.java:8816)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.os.Handler.handleCallback(Handler.java:587)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.os.Handler.dispatchMessage(Handler.java:92)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.os.Looper.loop(Looper.java:123)
04-20 15:50:06.703: E/AndroidRuntime(323):  at android.app.ActivityThread.main(ActivityThread.java:4627)
04-20 15:50:06.703: E/AndroidRuntime(323):  at java.lang.reflect.Method.invokeNative(Native Method)
04-20 15:50:06.703: E/AndroidRuntime(323):  at java.lang.reflect.Method.invoke(Method.java:521)
04-20 15:50:06.703: E/AndroidRuntime(323):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-20 15:50:06.703: E/AndroidRuntime(323):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-20 15:50:06.703: E/AndroidRuntime(323):  at dalvik.system.NativeStart.main(Native Method)
</code></pre>
