Deadmeet

Hello, I installed the client and server on my computer using DMPUpdater.exe (I launched it on the KSP game folder AND in the server game folder). I launch the server, it says all is OK (I also opened the port 6702). I launch KSP, I see the Darkmultiplayer menu, I connect to my local server, it begin to load some stuff, but at a moment I have the following error : Connection ended: Unhandled error while syncing! Do you have any ideas on that error and the way to solve it ?