error in xml parsing

i built a code that switch from one activity to another. when run this code it prints following errors. Error in an XML file: aborting build. and Installation error: INSTALL_PARSE_FAILED_BAD_SHARED_USER_ID here is my xml file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="wishme.code"
    android:versionCode="1"
    android:versionName="1.0" android:sharedUserId="@string/app_name">



    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".WishMeActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Activity2"></activity>
    </application>
<uses-sdk android:minSdkVersion="8" />
</manifest>

here is activity 1

package wishme.code;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.provider.Contacts.Intents;
import android.widget.TextView;
import android.view.View;
import android.widget.EditText;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.Toast;

public class WishMeActivity extends Activity {
    private EditText text;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     text=(EditText) findViewById(R.id.editText1);
    }

 public void myClickhandler(View view)
 {
     switch(view.getId())
     {
     case R.id.button1:
         RadioButton celsiusbutton=(RadioButton) findViewById(R.id.radio0);
         RadioButton fahrenheit=(RadioButton) findViewById(R.id.radio2);
         if(text.getText().length()==0)
         {
             Toast.makeText(this,"Enter a Valid Value",Toast.LENGTH_LONG).show();
             return;

         }
         float input=Float.parseFloat(text.getText().toString());
         if(celsiusbutton.isChecked())
         {text.setText(String.valueOf(convertFahrenheitToCelsius(input)));
        celsiusbutton.setChecked(false);
            fahrenheit.setChecked(true);}
         else
         {
             text.setText(String.valueOf(convertCelsiusToFahrenheit(input)));
             fahrenheit.setChecked(false);
             celsiusbutton.setChecked(true);
         }
         break;
     case R.id.button_nxt:
         Intent myintent=new Intent(view.getContext(),Activity2.class);
         startActivityForResult(myintent, 0);
         break;



     }
 }
 private float convertFahrenheitToCelsius(float fahrenheit) {
        return ((fahrenheit - 32) * 5 / 9);
    }

    // Converts to fahrenheit
    private float convertCelsiusToFahrenheit(float celsius) {
        return ((celsius * 9) / 5) + 32;
    }
}

and finally this is activity 2

package wishme.code;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class Activity2 extends Activity{

    public void onCreate(Bundle savedInstancestate) {
        super.onCreate(savedInstancestate);
        setContentView(R.layout.main2);
        Button previous=(Button) findViewById(R.id.button_prev);

    }
    public void prevclickhandler(View view)
    {
        Intent intent=new Intent();
        setResult(RESULT_OK,intent);
        finish();
    }
}

please suggest me the solution.