[Client] "An unexpected error has occurred while attempting to join the queue."

Not sure what to do or what exactly caused this, but I can't join a single queue as of right now. I repaired the client, checked the firewall, and still it shows that, implying that this is an indicator something on the client is definetly broken. Any ideas on how to fix this bug?

Also I wrote support already HOURS ago, but still no response...