NaoN

So the last time i played this game worked perfectly fine even though it was like 3 months ago. I wanted to start playing it again with my friend because i heard that there was a new update and i got excited to try it out. I started steam and updated the game and started running the game. For my friend it worked perfectly fine, but for me it kept showing up this. https://imgur.com/a/un0ki9z . So I started searching on the Google for a fix and couldn't find a fix for it, I can play the game offline but multiplayer is not working. Any help please, thanks!