robotium test gets stuck on "Sending test information to Eclipse"

I am trying to run an ui test using robotium. I have a simple test case:

public class test1 extendsActivityInstrumentationTestCase2<MainActivity> {
private Solo solo;
public test1() {
super(MainActivity.class);
}
public void setUp() throws Exception {
 super.setUp();
    setActivityInitialTouchMode(true);
    solo = new Solo(getInstrumentation(), getActivity());
}
public void testButtons() throws Exception {
    getInstrumentation().waitForIdleSync();
    assertTrue(solo.waitForActivity("MainActivity",3000));
}
@Override
public void tearDown() throws Exception {
  try {
      solo.finalize();
      } catch (Throwable e) {
      e.printStackTrace();
      }
      getActivity().finish();   
      solo.finishOpenedActivities();
      super.tearDown();
      }

It worked, but the app got bigger and now it even doesnt run the tests. I allways gets stuck while doing: "Sending test information to Eclipse":

    [2015-06-24 05:14:20 - gui_test] Launching instrumentation android.test.InstrumentationTestRunner on 
    [2015-06-24 05:14:20 - gui_test] Sending test information to Eclipse

It doesnt perform "running tests...". what can be the cause?