Failed to join requested game?

I cannot join any server (both official and non). Every server that I attempted to join causes the following error:

Failed to join requested game.

I am on Revision (#104551/18892). I am on the PC. What can I do so that I can play the game?

Can anyone help me?

I install CE on a different PC and I get the same error. I need someone to help me out here.

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