I'm trying to get a project that ran on MacRuby 0.4 and Leopard working with 0.5 on Snow Leopard. When I launch the app I get the following errors: 2009-09-15 20:08:08.954 TwittRb[87043:a0b] Unknown class 'TwittRbDelegate', using 'NSObject' instead. Encountered in Interface Builder file at path /Users/alex/Development/peepcode-meet-macruby/ build/Debug/TwittRb.app/Contents/Resources/English.lproj/MainMenu.nib. 2009-09-15 20:08:08.969 TwittRb[87043:a0b] Could not connect the action hideCredentials: to target of class NSObject 2009-09-15 20:08:08.970 TwittRb[87043:a0b] Could not connect the action submitCredentials: to target of class NSObject 2009-09-15 20:08:08.971 TwittRb[87043:a0b] Could not connect the action retrieveTweets: to target of class NSObject 2009-09-15 20:08:08.971 TwittRb[87043:a0b] Could not connect the action postTweet: to target of class NSObject 2009-09-15 20:08:08.991 TwittRb[87043:a0b] *** Illegal NSTableView data source (<NSObject: 0x200312360>). Must implement numberOfRowsInTableView: and tableView:objectValueForTableColumn:row: When I load the Nib in Interface Builder everything looks okay (no warnings or errors) so I'm not sure what I need to change to make this go. Any thoughts? Cheers, Alex ---- Musings & Notes — http://alexvollmer.com Track what you lend and borrow — http://moochbot.com