Netchannel: unknown net message (39) from

So me and my friend are trying to play Gmod together, but every time he joins, he gets stuck on “Retrieving Server Info” it gets stuck at the 18th bar, then when he checks the console it says “Netchannel: unknown net message (39) from” Any help would be appreciated.

Edit: I just un-installed then re-installed all of my addons, everything seems to work now!

Good job giving out your friend’s IP address.

Saved it in a text file, because reasons.

It isn’t his, nor is it really mine, we’re using Hamachi because everytime I port forward, it doesn’t work…