Workshop Complete error (Timed out or Lost connection)

When I try to connect to a server where my friends are playing on it.The loading screen gets stuck 30 secounds in the workshop complete part.When it’s done it’s giving me a error saying “I timed out” or “Lost connection”.It’s strange because I can join other servers but I can’t the one my friends are playing it.And I have all the addons and contents that the server uses.I succed once to connect but I lost the connection to the server like my internet crashed or the server closed and I don’t have any problems with my internet.

It’s this from my gmod or from the server?

How the problem can be fixed if it’s from me or from the server.