// Ко всем Forward:

forward ProxDetector(Float:radi,playerid, string[],col1,col2,col3,col4,col5);

OnPlayerText заменить на паблик:
public OnPlayerText(playerid, text[])
{
    new pname[24], str[128];
    GetPlayerName(playerid, pname, 24);
    format(str, sizeof(str), "%s говорит: %s", pname, text);
    ApplyAnimation(playerid, "PED", "IDLE_CHAT", 4.1, 0, 0, 0, 1, 1, 1);
    ProxDetector(20.0, playerid, str, cWhite, cWhite, cWhite, cWhite, cWhite);
    SetPlayerChatBubble(playerid, text, cWhite, 15.0, 10000);
    return 0;
}

public ProxDetector(Float:radi, playerid, string[],col1,col2,col3,col4,col5)
{
    if(IsPlayerConnected(playerid))
    {
        new Float:posx, Float:posy, Float:posz;
        new Float:oldposx, Float:oldposy, Float:oldposz;
        new Float:tempposx, Float:tempposy, Float:tempposz;
        GetPlayerPos(playerid, oldposx, oldposy, oldposz);
        for(new i = 0; i < MAX_PLAYERS; i++)
        {
            if(IsPlayerConnected(i) && (GetPlayerVirtualWorld(playerid) == GetPlayerVirtualWorld(i)))
            {
                GetPlayerPos(i, posx, posy, posz);
                tempposx = (oldposx -posx);
                tempposy = (oldposy -posy);
                tempposz = (oldposz -posz);
                if (((tempposx < radi/16) && (tempposx > -radi/16)) && ((tempposy < radi/16) && (tempposy > -radi/16)) && ((tempposz < radi/16) && (tempposz > -radi/16))) // If the player is within 16 meters
                {
                    SCM(i, col1, string);
                }
                else if (((tempposx < radi/8) && (tempposx > -radi/8)) && ((tempposy < radi/8) && (tempposy > -radi/8)) && ((tempposz < radi/8) && (tempposz > -radi/8))) // within 8 meters
                {
                    SCM(i, col2, string);
                }
                else if (((tempposx < radi/4) && (tempposx > -radi/4)) && ((tempposy < radi/4) && (tempposy > -radi/4)) && ((tempposz < radi/4) && (tempposz > -radi/4))) //4 meters
                {
                    SCM(i, col3, string);
                }
                else if (((tempposx < radi/2) && (tempposx > -radi/2)) && ((tempposy < radi/2) && (tempposy > -radi/2)) && ((tempposz < radi/2) && (tempposz > -radi/2))) //2 meters
                {
                    SCM(i, col4, string);
                }
                else if (((tempposx < radi) && (tempposx > -radi)) && ((tempposy < radi) && (tempposy > -radi)) && ((tempposz < radi) && (tempposz > -radi))) //1 meter
                {
                    SCM(i, col5, string);
                }
            }
            else
            {
                SCM(i, col1, string);
            }
        }
    }
    return 1;
}