So the skin normally works but on this one server I could't see my sentry all I could see was the shadow and this sea of red with this error happened not sure what it means..

Material models/buildables/lsentry2/lsentry2_blue does not support vertex format used by the mesh (maybe missing fields or mismatched vertex compression?), mesh will not be rendered. Grab a programmer!
it just kept saying that error untell I left the server.