It sadly happend. My application does not work after upgrade

When opening i see:
2012-03-08 11.58.43 am.jpg

Many of my Views are empty in the designer (as on the image).
When running the application i get this error:
TypeError: 'undefined' is not a function (evaluating 'groupFn.call(this, item1)')
What can I do to upgraded my application and get it to work? Is there something you have to do? A way to see errors?
Sad Panda....