When I run the project I'm getting error as fatal exception: main in logcat

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Mobile

Android

This is my Contact.java

package com.example.helloworld;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;

public class Contact extends Activity {
EditText textName;
EditText textSubject;
EditText textMessage;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.contact);
}
public void List(View v){
super.onBackPressed();
}

public void SendMail(View v) {

final GMailSender sender = new GMailSender("nani22791@gmail.com", "xxxxx");
new AsyncTask<void,>() {
@Override public Void doInBackground(Void... arg) {
try {
sender.sendMail("hi","message","murugan","murugan.siva87@gmail.com");
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
}
return null;
}
}.execute();

}
}