g++ help

[Alfred]

I am at a loose end here :)
I am getting this error from g++:
../Src/SteamValidateUserIDTickets.cpp:1533: no matching function for call to
`ExtractNext (u8 *,
unsigned int, u8 *&, u8 *&)'
../../../Common/Network/SocketHelperFunctions.h:408: candidates are: void
common::ExtractNext (u8 *,
const u8 *&, const u8 *)
../../../Common/Network/SocketHelperFunctions.h:419:                 void
common::ExtractNext (u16 *,
const u8 *&, const u8 *)
../../../Common/Network/SocketHelperFunctions.h:437:                 void
common::ExtractNext (u32 *,
const u8 *&, const u8 *)
../../../Common/Network/SocketHelperFunctions.h:459:                 void
common::ExtractNext (u8 *,
unsigned int, const u8 *&, const u8 *)

Why, oh why, can't g++ (2.96) match the function call to the last function?
Surely it can do the type conversion. What am I doing/thinking wrong?

Sincerly,
    Confused ;)

Alfred