Can you tell us at least where the error occurs?
Error is line 88 in herkulex.h file
This line reads as
int checksum1(byte* data, int lenghtString);
There is also no mentioning of 'HerkulexClass' in the lines before or after...
Are you sure the attached project is the one giving the error?
I get the compile error in line 46. And the reason is simple: you have a file defined as 'C', and have C++ code in it. You might want to look at cladlab.com/programming-2/how-to-use-c-with-psoc-creator about how to do C++ in Creator. I personally would suggest not to do it, it is not worth the hassle...