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Error on argument and parameter type of functions

I'm trying to build and IPV6 connection between the 6678 and a PC with IPV6 and CCS is returning this error when I try to complie the code:

The type of the argument and the type of the parameter are exactly the same for me, except for that "C" at the end of the type of the parameter.

What does that C mean? How can I fix this?

CCS version : 5.5.0.00077