You have to push an instance of a view, not the name of a class.
So you'd need to, for instance, do something like this:
Where ViewTwo is the class name of the second view.
Take a look at the MVC features of Sencha Touch 2 also. Ideally you'd push/pop views from a controller, and you'd have ViewTwo named something like MyApp.view.ViewTwo .
For future, I think the Q&A forum is for specific issues people have with their code - you're more likely to get a prompt response there next time!