[Faisal_khan]

Why are you putting the no. of characters of the command 10 though it is 9?

pawn Код:

strcmp("/multiplay", cmdtext, true, [B]10[/B]) == 0) }

It should be

pawn Код:

strcmp("/multiplay", cmdtext, true, [B]9[/B]) == 0) }

If you don't know what the fourth parameter stands for, it is the no. of characters in your command.