2011-01-24 12:49:59.519 iota[52046:207] Unknown class InterfaceAppDelegate in Interface Builder file.
2011-01-24 12:49:59.526 iota[52046:207] Unknown class InterfaceViewController in Interface Builder file
the above says that your XIB is pointing to a class that does not exist in your project.
In Interface Builder check the class settings. All views and objects should be set to either a standard class or to a custom class that is part of your project. It could be a spelling error...
