Shuji at Zwift HQ here. Scanning through your server logs, I can see that your PC is running Zwift Launcher v1.1.14.
Installing Launcher v1.1.15 or newer may help solve this error. The main difference is that your Zwift files will no longer be written to your Documents folde after updating to 1.1.15+
To be thorough, I’d recommend you completely uninstall Zwift-related files following these instructions.
Then download the latest version of the game (including the latest launcher build) from zwift.com/downloads.
Would you give that a try and let us know that clears this up?