ios - Undefined symbols for architecture x86_64: Xcode 6.0.1 -

ios - Undefined symbols for architecture x86_64: Xcode 6.0.1 -

i'm getting next errors, when seek compile xcode project. how add together these class' compile sources in xcode 6.0.1?

undefined symbols architecture x86_64: "_objc_class_$_cptcolor", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptfill", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptgradient", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptgraphhostingview", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptlegend", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptlinestyle", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptmutabletextstyle", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptpiechart", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cpttextlayer", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cpttheme", referenced from: objc-class-ref in piechartviewcontroller.o "_objc_class_$_cptxygraph", referenced from: objc-class-ref in piechartviewcontroller.o "_kcptplainwhitetheme", referenced from:

ios xcode architecture undefined-symbol