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The error may be the result of:

1. Too large cookie files. This issue is often caused by a huge number of installed add-ons. Clean up your browser's cookies to resolve this issue.

2. Noncredible data sent from your PC. It may be caused by your browser issues, malicious software (including add-ons), spyware, proxy, ISP invalid data formatting etc.
Make sure to:
- Check if the game runs in a different browser than you usually use,
- Check if you can join other game servers,
- Scan your computer.

Such errors are most often temporary, as they are usually the result of changes made by Internet Service Providers.