Iphone-exif 0.91 not working when I add it to my project, gives error ".objc_class_name_EXFJpeg", referenced from:

Question

When I add libiphone-exif.a to snapandrun in objectiveflickr I get this error:

".objc_class_name_EXFJpeg", referenced from:
literal-pointer@__OBJC@__cls_refs@EXFJpeg in SnapAndRunViewController.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

I do not know what this means, I follow the guide to add it, add all of the .h files and the libiphone-exif.a

Is there something special I have to do?