ios - Apple Mach-o error linked -

i error , have no idea why out, apparently libraries linked

  ... "_equalto", referenced from:   -[fbfacebookappauthenticationtests testimplfacebookappauthsuccesswithbehavior:] in fbfacebookappauthenticationtests.o   -[fbgraphobjecttests testcansetproperty] in fbgraphobjecttests.o   -[fbgraphobjecttests testinsertobjectatindex] in fbgraphobjecttests.o   -[fbgraphobjecttests testaddobject] in fbgraphobjecttests.o 

etc...

http://i.stack.imgur.com/fabie.png