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hi i get one error while compiling a pm command

Quote:

(391) : error 017: undefined symbol "params"

PHP код:

if(strcmp(cmd, "/pm", true) == 0)
{
       new str[256], str2[256], id, Name1[MAX_PLAYER_NAME], Name2[MAX_PLAYER_NAME];
    if(sscanf(params, "us", id, str2)) EDIT: Error is this line
    {
        SendClientMessage(playerid, 0xFF0000FF, "Usage: /pm <id> <message>");
        return 1;
    }
    if(!IsPlayerConnected(id)) return SendClientMessage(playerid, 0xFF0000FF, "ERROR: Player not connected");
    if(playerid != id) return SendClientMessage(playerid, 0xFF0000FF, "ERROR: You cannot pm yourself!");
    {
        GetPlayerName(playerid, Name1, sizeof(Name1));
        GetPlayerName(id, Name2, sizeof(Name2));
        format(str, sizeof(str), "PM To %s(ID %d): %s", Name2, id, str2);
        SendClientMessage(playerid, 0xFF0000FF, str);
        format(str, sizeof(str), "PM From %s(ID %d): %s", Name1, playerid, str2);
        SendClientMessage(id, 0xFF0000FF, str);
    }
    return 1;
} 


here is my code i make it from a toturial and now i cant fix this error i search on forums and nothing if someone can help im apreciate its a small code