What does the referenced "_OBJC_CLASS _ $ _ CATransaction" mean: "compile-time error?

Question

Can someone tell me what this error is, I'm trying to compile xcode

"_ OBJC_CLASS _ $ _ CATransaction", link from:

objc-class-ref-to-CATransaction in RefreshTableViewHeader.o 

And this mistake

"_ kCATransactionDisableActions", link from:

  _kCATransactionDisableActions$non_lazy_ptr 

at RefreshTableViewHeader.o

  (maybe you meant: _kCATransactionDisableActions$non_lazy_ptr) 

ld: character not found

collect2: ld returned 1 exit status

Google did not help.

Am I missing the frame ...?

Answer 1

This is a linker error indicating that you are missing some characters. Try adding a QuartzCore structure to link to your project.