Duplicate Classes

I am working on an iPhone app and after upgrading to the latest Xcode 4, I received the following error message:

GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Thu Jan 27 08:34:47 UTC 2011)
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This GDB was configured as "x86_64-apple-darwin".Attaching to process 3014.
objc[3014]: Class Property is implemented开发者_如何转开发 in both /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.0.sdk/System/Library/PrivateFrameworks/Notes.framework/Notes and /Users/bschiff/Library/Application Support/iPhone Simulator/4.0.2/Applications/7D73796D-01B5-4F0E-A173-E45953945FD2/Versity.app/Versity. 
One of the two will be used. Which one is undefined.

I have a Core Data object called Property, and I understand from this error message that a class named Property has been declared somewhere else in the SDK.

I also realize that the proper way to fix this would be to refactor all of my code to change Property into BSProperty or use some alternative name.

That would be quite a large undertaking, and before I do that I'm wondering if I can force XCode to use the Property object in my app rather than the other one that's defined somewhere else. Is this possible?

Thank you

It looks like you found an undocumented class (PrivateFrameworks). Unfortunately, I think this means you have to refactor.

iPhoneSimulator4.0.sdk/System/Library/PrivateFrameworks/Notes.framework/Notes indicates that this is a private class, and in that case there is nothing you can do but refactor.