I tried starting a JUnit test (robotium) for my app:
public class MainTest extends ActivityInstrumentationTestCase2 {
private Solo so
Check that you're not proguarding out a method that your test's contructor depends upon but that nothing in the application uses - logcat will complain about a missing class or method from your application package.
Try uninstalling the target package, to check it's not left over from an alternate build (if, for instance you use Maven alongside Eclipse).