Command block issue

i have server named --pvp-- minigames! , so its pvp server and i use command block ,for example /give @p diamond_sword to give players all what the need to pvp , i opened my server now but the command blocks doesnt work an d i am sure that the commands is correct cuz i typed the same command but in chat and it worked so please fix it Important : when i started the server i enabled the cheats