[Tingesport]

Код:

COMMAND:banip(playerid, params[])
{
	new eReason [ 64 ], iReason[ 128 ], tmp[ 64 ], string[ 128 ];
	if(sscanf(params, "s[64]s[128]", eReason, iReason)) return SCP(playerid, "[IP Range][Reason]");

	format(tmp, sizeof(tmp), "banip %s", eReason);
	SendRconCommand(tmp);
	SendRconCommand("reloadbans");

	format(string, MAX_STRING, "4[ IPBAN ] IP address %s has been banned. Reason: %s", eReason, iReason);
	iEcho(string);
	return 1;
}

You need to specify string size within sscanf parameters even though it's specified.