CCNA, CCNP, MCSA, CCNA Final Exam, All Answer Test Module With 100/100

I'm using Xcode 4.2 on Mac OS X Lion 10.7.3 and for some reason, every time I set UIGroupTableViewBackgroundColor as the background color on my UIView, the compiler refuses to build my app. When I open the "newly corrupted" XIB as XML and remove the offending XML represenation of the background color, the app compiles. I am able to apply the background color in code, but doing so in Interface Builder fails miserably. Here's the code that chokes Xcode. Any clue why this is happening? <object class="NSColor" key="IBUIBackgroundColor"> <int key="NSColorSpace">10</int> <object class="NSImage" key="NSImage"> <int key="NSImageFlags">549453824</int> <string key="NSSize">{512, 1}</string> <array class="NSMutableArray" key="NSReps">