Hello,
This type of error is usually caused by a poor local/server connection. There are a few things you can try. The most likely fix, if it is indeed a connection issue, is to try a VPN. We recommend multiple VPNs or multiple servers on multiple VPNs to try to route yourself around the problem.

It is also possible that your game files were corrupted. If this is the case, a fresh reinstall of the client can solve your issue.
Thanks!