My mobile app gives the error "unfortunately the app has stopped" and would not show any error

Question

The day after my fyp presentation and my mobile help give me this error.

package com.example.nauma.myapplication;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
 import org.ksoap2.*;
 import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
public class MainActivity extends Activity {

private EditText editText1;
private TextView textView1;
private Handler mHandler=new Handler();
private String inputId;

Form name

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    editText1=(EditText) findViewById(R.id.editText1);
    textView1=(TextView)findViewById(R.id.textView1);


}

public void getMaterial (View v)
{
    String inputId=editText1.getText().toString();

emulator IP

    String [] params =new String [] {"10.0.2.2",inputId};

my pc IP

    //String [] params =new String [] {"192.168.0.106",inputId};

    new MyAsyncTask().execute(params);

}

This is my operation of webservices

class MyAsyncTask extends AsyncTask <String, Void, String>
{
    public String SOAP_ACTION= "http://threepin.org/empget";
    public String OPERATION_NAME ="empget";
    public String WSDL_TARGET_NAMESPACE="http://threepin.org/";
    public String SOAP_ADDRESS;
    private SoapObject request;
    private HttpTransportSE httpTransport;
    private SoapSerializationEnvelope envelope;
    Object response=null;



    @Override
    protected String doInBackground(String... params)
    {

        SOAP_ADDRESS ="http://"+params[0]+"/WebService1.asmx";
        request=new SoapObject (WSDL_TARGET_NAMESPACE,OPERATION_NAME);
        PropertyInfo pi=new PropertyInfo();
        pi.setName("id");
        pi.setValue(Integer.parseInt(params[1]));
        pi.setType(Integer.class);
        request.addProperty(pi);
        pi=new PropertyInfo();

        envelope =new SoapSerializationEnvelope (SoapEnvelope.VER11);
        envelope.dotNet=true;
        envelope.setOutputSoapObject(request);
        httpTransport=new HttpTransportSE (SOAP_ADDRESS);
        try
        {
            httpTransport.call(SOAP_ACTION, envelope);
            response=envelope.getResponse();
        }
        catch (Exception exp){
            response=exp.getMessage();
        }

When code come on this section it crash application and give error unfortunately the app has stopped

        return response.toString();
    }
    @Override
    public void onPostExecute(final String result)
    {
        super.onPostExecute(result);
        mHandler.post(new Runnable()
        {
            @Override
            public void run(){
                textView1.setText(result);
            }
        });
    }
}

This is my Web Service

   [WebMethod]
    public string empget(int eid)
    {

Employee detail

        conn.con.Open();
        string sqlcommand = "select emp_first_name,salary,position from
         tbl_employee_tbl where employee_id='" + eid + "'";
        SqlCommand cmd = new SqlCommand(sqlcommand, conn.con);

        SqlDataReader reader = cmd.ExecuteReader();
        string abc = null;
        while (reader.Read())
        {
            string Ename = reader["emp_first_name"].ToString();
            string Esalary = reader["salary"].ToString();
            string Eposition = reader["position"].ToString();

            abc = "emp_first_name=" + Ename + "," + "salary=" + Esalary +
           "," + "position=" + Eposition;
        }
        conn.con.Close();
        return abc;


    }