So ... I wanted to build one Map in Minecraft . Command Blocks are deactivated . So I gave me a Playerhead with the following command over the ^{Server-Console} . The command is the following :

give @p skull 1 3 {display:{Name:"K"},SkullOwner:{Id:"6e5daf43-e36d-41e2-a18b-536e013d4538",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYWY0OWZiNzA4MzY5ZTdiYzI5NDRhZDcwNjk2M2ZiNmFjNmNlNmQ0YzY3MDgxZGRhZGVjZmU1ZGE1MSJ9fX0="}]}}}

After that I was kicked from the Server with the Error-Code ( see it on the Attachement ) . After that I restarted and stopped the Server and I had done much things .

I restarted my game ; I stopped and started / restarted the Server ; I deleted the world from the Server manually with ''Multiverse'' and Deleting normaly . I downloaded the World and I had played in Singleplayer . It had worked . So the Server is hosted by ''Host Unlimited''

Please help it to solve it