Hi Pulling my hair out in trying to get a simple window based project to compile.

I am running both 3.2.2 and 3.2.3 versions of Xcode. The latter is set up in a separate folder.

Originally I used the latter to create and compile my project against the new 4.0 sdk. It compiled fine. Then I made the mistake of deleting some sdks I thought I no longer needed.

Ever since I can no longer compile.

Right now I get a dozen or so errors similar to the following "_OBJC_CLASS_$_CATransition", referenced from: objc-class-ref-to-CATransition in ViewTransitionsAppDelegate.o

My active executable is the iphone simulator 4 and Base SDK is iPhone device 3.0.

I tried reinstalling the xcode3.2.3 installer, no difference.

I'm totally stymied, as my project WAS working and compiling fine, both to the simulator and external device.

Are there any best practices or recommended steps in fixing or rebuilding a project when it won't compile?

Any help welcome!