[[XST]O_x]

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (strcmp("/da", cmdtext, true, 10) == 0)
    {
        SetPlayerPos(playerid, 2075.3584,1312.7797,10.6719);
        SetPlayerInterior(playerid, 0);
    }
    if (strcmp("/teles", cmdtext, true, 10) ==0)
    {
        SendClientMessage(playerid,COLOR,"/da-Desert Airstrip terror");
    }
return 0;
}

That should work.
You wrote SendClientMassage,It's supposed to be SendClientMessage.
I Fixed a lot of other errors you had.