Recently I opened a fairly old xCode project in xCode 4.0 and received the following error
error: Illegal Configuration: Pattern colors on iOS versions prior to 3.0
The error is due to incompatibilities with older nib/xib files prior to version 3.0
To fix the error or make the warning go away change the Deployment type in theInterface Builder Document settings below:
Setting this to 3.0 or above will fix the error, the why’s and where for’s are beyond me and to be honest I don’t care as long as the little red triangles go xCode is happy and so I am happy.