Objective-C Category Causing unrecognized selector

Question

My project has a UIImage category function that I want to call from another class. I properly import the header file for the image category and I get the projec

Answer 1

Yet another possibility:

This is almost too embarrassing to admit, but just in case someone might have done the same silly mistake:

I was copying code from one project to another, and by mistake I had pasted the same source code in the .h file and the .m file (in both I had put the code meant for the .h file). I fixed my .m file and it worked.