Inncorrect Mesh Prefix for meta mesh copy: 0 (ref:1). Help

[zutt2]

I get this error "Inncorrect Mesh Prefix for meta mesh copy: 0 (ref:1)" when loading a map I made in NW. Why do other players and I always get this error when loading the map?

 

[MaHuD]

What version are you using?