It seems that in CoreNet.h, there are two constructors declared. However, only the first constructor is defined in CoreNet.cpp.
If you look in CoreNet.h, you'll notice that
FNetBitReader( int64 InMaxBits );
has a warning:
Function definition for FNetBitReader not found
FNetBitReader( UPackageMap* InPackageMap=NULL, uint8* Src=NULL, int64 CountBits=0 ); FNetBitReader( int64 InMaxBits );
Result: Notice that the constructor declared second in the .h file is not defined in the .cpp
Expected: The function would be defined in the .cpp
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