[Oskaar1994]

You've got a small bug in the include since some versions. It will cause a tag mismatch warning.
Fix:
Replace

Code:

native GetPlayerRaceCheckpoint(playerid, &Float:fX, &Float:fY, &Float:fZ, &Float:fNextX, &Float:fNextY, &fNextZ, &Float:fSize);

With:

Code:

native GetPlayerRaceCheckpoint(playerid, &Float:fX, &Float:fY, &Float:fZ, &Float:fNextX, &Float:fNextY, &Float:fNextZ, &Float:fSize);

Infront of fNextZ was a Float tag missing.