How do I add messagebox in android

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Android

the error is occurring with this code like "unfortunately stop"

What I have tried:

Textview lblalert = (TextView)findViewById(R.id.txtm);
lblalert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog alert = new AlertDialog.Builder(Home.this).create();
alert.setTitle("Alert");
alert.setMessage("You are not registered BBN member. To see the detail please cantact to administrator");
alert.show();
}
});