summon Villager

when I summon a villgaer whit a custom trade like this comment

/summon Villager ~ ~1 ~ {Profession:4,Attributes:[{Name:generic.followRange,Base:1.0},{Name:generic.movementSpeed,Base:0.001}],PersistenceRequired:1,Invulnerable:1,Offers:{Recipes:[{maxUses:1,buy:{id:266,Count:3,tag:{display:{Name:"Gold"},HideFlags:1,ench:[{id:0,lvl:1}]}},sell:{id:258,Count:1,tag:{display:{Name:Battle Axe}}}},{maxUses:1,buy:{id:0,Count:1},sell:{id:0,Count:1}}]}}

I summon It and log of my minecraft map I open the map again and the villager is gone and the command block is back, i don't now what the do about it.