The title sums up the thing. W've been trying to build planes on multiplayers but we can't get them working. Everyone has the mod installed on client side and the same files (Skeleton and vehicles) are on server side. I attached what the server says when people are disconnected. After few try in creative, seems that it does the same with all the panes, either we can't get a start or attach instruments.
message.txt

This is a duplicate of #354. Update your version of MTS to the most recent (V17.3.1) and the error will go away.

Alright, thanks for the fast update about the problem. I saw the duplicate label, sorry the time wasted, didn't know about the "Closed" section. Love the mod and thanks for the hard work !