[PowerPC603]

Also an error:

pawn Код:

new text,string[70], pName[MAX_PLAYER_NAME];
    if(sscanf("s",text)) return SendClientMessage(playerid,COLOR_ERROR,"Usage: /o [Msg]"); // line with error

Should be:

pawn Код:

new text[128], string[70], pName[MAX_PLAYER_NAME];
    if(sscanf(cmdtext, "s[128]",text)) return SendClientMessage(playerid,COLOR_ERROR,"Usage: /o [Msg]"); // line with error

You were reading text into an integer variable, while you gave sscanf the instruction to extract a string.