iOS IL2CPP Build lacks some files.

I use Unity 4.6.5p1. When building Xcode project generated with IL2CPP build, I got the following exceptions. System_Core_System_Func_2_gen_970.h" file not found. Looks like there are no such a file in Xcode project directory. This exception is seen in "XcodeProjectRoot/Classes/Native/GenericMethods31.cpp". I think some files(.cpp, .h, etc..) are insufficient. Any kind of help please.