[jasperschellekens]

Did you put a closing bracket?

PHP код:

CMD:gtag(playerid,params[])
{
        new str[5],id=pInfo[playerid][grouppid],string[128];
        if(strcmp(GroupInfo[id][gLeaderName], GetPlayerNamee(playerid)) != 0) return SendClientMessage(playerid,COLOR_RED,"[ERROR]: You are not a leader of any group.");
        if(sscanf(params, "s[5]",str)) return SendClientMessage(playerid,COLOR_GREY,"[USAGE]: /gtag [New Tag for GROUP]");
        if(strlen(str) > 5 || strlen(str) < 5 ) return SendClientMessage(playerid,COLOR_RED,"[ERROR]: Your group tag must be set max. 5 character.");
        format(GroupInfo[id][gTAG],5,str);
        format(string,sizeof(string),"[GROUP-ATTENTION(%s)]: %s named group leader has changed group TAG as '%s'.",GroupInfo[id][gName],GetPlayerNamee(playerid),str);
        SendGroupMessage(0x8080FFFF, id, string);
        return 1;
} 


I also really suggest to take care of that loose indentations. Better for you, and better for the script.