I’m using Interface Builder 3 in Mountain Lion. It works well, but for some reason 2 xib files cannot be loaded. The error message is:
Locate the com.apple.imagekit.ibplugin Interface Builder plug-in to continue opening this document. Press "continue" to continue opening without resolving the dependency.
I’m not sure what kind of plugin com.apple.imagekit.ibplugin is, and where should I get it. I can’t find it installed on the system indeed.
Your error means that Xcode (or Interface Builder) doesn’t know about the com.apple.imagekit.ibplugin (which is strange)
In apple’s Xcode release notes, since Xcode 4.1, IBPlugins are no longer supported. Therefore, they do not exist in Lion (I believe.) In order to fix this problem, open Interface Builder preferences, and click plugins. If you see imagekit, thats interesting but you probably don’t. This is just to check whether you have the plugin or not.
To fix this, you have to add the imagekit framework back into the project. It should work now. If it doesn’t, you have to go to the interface builder plugin prefs and add the plugin located in the imagekit framework (under imagekit.framework/resources).
Sorry if it doesn’t work because I have not encountered the problem and I’m also running Xcode 4.