title: Session 'app': Error Launching activity
body: <p>After the Android Studio 2.0 update while the gradle build  finishes I get this :</p>
  <p>Session 'app': Error Launching activity .</p>
  <p>It prevents the app from starting but it's installed in my emulator.
  This is what comes up in the Run tab :</p>
  <blockquote>
  <p>Unexpected error while executing: am start -n &quot;com.example.user.ypologismosmoriwn/com.example.user.ypologismosmoriwn.MainActivity&quot; -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
  Error while Launching activity</p>
  </blockquote>
  <p>Here is the code:</p>
  <pre><code>package com.example.user.ypologismosmoriwn;
  
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  
  public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
      }
  }
  </code></pre>
  <p>It's just an empty Activity,nothing added</p>
  <p>and the XML code is just a Relative Layout with 4 Texts and 3 Check Boxes</p>
  <p><a href="http://pastebin.com/GyV82kP6" rel="noreferrer">This is the logcat i am getting</a></p>
  <p>Thanks anyone who is willing to help</p>