oldsatchmo: I've managed to recover your project, here it is:
http://dl.dropbox.com/u/15217362/oldsatchmo-recovered.zip
It looks like you deleted the 'Text' object type, but Construct failed to remove all its actions and still saved a project with a 'Text' action. Then, when opening the project, it can't find the object type for that object.
It's been fixed for the next build - hopefully if you're careful about deleting objects (make sure C2 has deleted all events relating to it), it should be OK to keep working on this. The bug is fixed in the next release.