I can define a function but can't declare

I defined a function in file.c

#include file.h
unsigned char IsOWKeyRight(const CARD_KEY *Key);

while I had definition

typedef struct{
 unsigned char ID,
 unsigned char ExtID,
 unsigned char pwd
}CARD_KEY;

in an .h file which was included in file.h
Howerer, Keil told me"SYSTEM.H(62): error C141: syntax error near '*', expected ')'" when I declared the function in file.h like the following

extern unsigned char IsOWKeyRight(const CARD_KEY *Key);

what's wrong???!!!
Help!