NSUnknownKeyException [duplicate]

Answer 1

I also had the same issue.

Actually, I had created an outlet connection for a text. I named it "mytext", for some reasons i later decided to change the name and I deleted the @property declaration from the header.

As it turns out, the connection was deleted and the compiler kept on searching for "mytext".

I had to go into xib file and switch "connection explorer". It showed that "mytext" was still connected.

I removed the connection from there it started working.

Answer 2

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...