Sounds like you have "User Defined Runtime Attributes" set in the "Identity" 
panel, which was the rightmost one with an "i" icon in IB.

The problem is with the nib's "Development Target", which needs to be at least 
3.2. I know how and where to fix it in IB ("Window" -> "Document Info"), but 
the XCode nib editor rearranged everything. 

----- Original Message -----
From: "Dale Satterfield" <dsatterfi...@mac.com>
To: cocoa-dev@lists.apple.com
Sent: Saturday, July 23, 2011 2:36:45 AM
Subject: Error Message in 4.1(Lion)

I have a project that compiles fine with no errors under 4.02 under Snow 
Leopard. But under 4.1 I get the following about one of my xib's:
Class Unavailable
User defined runtime attributes with Interface Builder versions prior to 3.2

When I dbl-click this it opens the xib, but nothing indicates the issue. I am 
not using any classes other than NSView and one other class that I defined, 
LinearGraph.
Which is the same class out of the Xcode 3 Unleashed book. Not sure where to go 
looking for the problem.
Everything is there. I cannot find any more definitive info on that error 
message. I assume Interface builder is also version 4.1 ? Its no longer a 
separate product.

Dale Satterfield
dsatterfi...@mac.com

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