Помогите с ошибкой ReturnUser x2

[L1keee]

Добавил вот это

stock ReturnUser(text[])
{
    new pos = 0;
    new userid = RETURN_USER_FAILURE;

    while(text[pos] < 0x21) { // Strip out leading spaces
    if(text[pos] == 0) return RETURN_USER_FAILURE; // No passed text
    pos++;
    }

	if(isNumeric(text[pos])) { // Check whole passed string
        userid = strval(text[pos]);
        if(userid >=0 && userid < MAX_PLAYERS)
        {
            if(IsPlayerConnected(userid)) return userid;
            return RETURN_USER_FAILURE;
        }
    }

    // They entered [part of] a name or the id search failed (check names just incase)
    new len = strlen(text[pos]);
    new count = 0;
    new name[MAX_PLAYER_NAME+1];

    for(new i = 0; i < MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i))
        {
            GetPlayerName(i, name, sizeof(name));
            if(strcmp(name, text[pos], true, len) == 0) // Check segment of name
            {
                if(len == strlen(name)) { // Exact match
                    return i;
                }
                else { // Partial match
                    count++;
                    userid = i;
                }
            }
        }
    }
    if(!count) return RETURN_USER_FAILURE;
    if(count > 1) return RETURN_USER_MULTIPLE;

    return userid;
}

Что посоветовали
Выдаёт это

C:\Users\Weste\Desktop\Íîâàÿ ïàïêà\gamemodes\new.pwn(2535) : error 017: undefined symbol "RETURN_USER_FAILURE"
C:\Users\Weste\Desktop\Íîâàÿ ïàïêà\gamemodes\new.pwn(2538) : error 017: undefined symbol "RETURN_USER_FAILURE"
C:\Users\Weste\Desktop\Íîâàÿ ïàïêà\gamemodes\new.pwn(2542) : error 017: undefined symbol "isNumeric"
C:\Users\Weste\Desktop\Íîâàÿ ïàïêà\gamemodes\new.pwn(2547) : error 017: undefined symbol "RETURN_USER_FAILURE"
C:\Users\Weste\Desktop\Íîâàÿ ïàïêà\gamemodes\new.pwn(2573) : error 017: undefined symbol "RETURN_USER_FAILURE"
C:\Users\Weste\Desktop\Íîâàÿ ïàïêà\gamemodes\new.pwn(2574) : error 017: undefined symbol "RETURN_USER_MULTIPLE"
Pawn compiler 3.2.3664	 	 	Copyright (c) 1997-2006, ITB CompuPhase


6 Errors.

Дам + кто поможет