[Grant.]

Код:

{
if (strcmp("/entermech", cmdtext, true, 10) == 0)
{ < ------ This wasn't here before. its required.
    if(!IsPlayerInRangeOfPoint(playerid,5,1790.2391,-1720.8370,13.5395))
    {
        SetPlayerPos(playerid,-2029.798339,-106.675910,1035.171875);
        SetPlayerInterior(playerid,3);
        GameTextForPlayer(playerid,"Welcome to Cobomau Mechanics",4000,6);
        return 1;
    }
}

Little Issue I noticed, There..

Also! Playerid2 isn't defined anywhere
you might use this " GetPlayerName(playerid, sendername, sizeof(sendername));"
to Define it
Example
GetPlayerName(playerid, playerid2, sizeof(playerid2));

Find a way to incorporate that

I Dont really want to help re-write that whole script. So Just take what I said there and try and apply it