Use in ( Editor / Singelplayer / Multiplayer ) the Commanding mode key ->
Client-rpt:
1:53:10 Unknown attribute itemsCmd
1:53:10 Unknown attribute itemsCmd
1:53:24 Unknown attribute itemsCmd
1:53:24 Unknown attribute itemsCmd
1:53:26 Unknown attribute itemsCmd
1:53:26 Unknown attribute itemsCmd