@Marvin what is this error? i get it after trying to serve a flow after running

prefect server start

File "mypython/site-packages/cryptography/fernet.py", line 148, in _decrypt_data
    self._verify_signature(data)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "mypython/site-packages/cryptography/fernet.py", line 132, in _verify_signature
    raise InvalidToken
cryptography.fernet.InvalidToken

Your message was too long by 194 tokens...

The error message

cryptography.fernet.InvalidToken

typically indicates an issue with the encryption or decryption process, often due to a mismatch in the keys used. This can happen if the token you're trying to decrypt was not encrypted with the same key, or if the token has been tampered with or corrupted. Here are a few steps you might consider to troubleshoot this issue: 1. Key Consistency: Ensure that the key used for encryption and decryption is consistent and correctly set in your environment variables or configuration files. 2. Environment Setup: Double-check your environment setup to make sure everything is configured correctly. If you're using a self-hosted Prefect server, ensure the server's environment matches the one where the flow was deployed. 3. Prefect Version: Confirm that you are running the latest version of Prefect, as updates may contain fixes for known issues. You can upgrade Prefect using

pip install --upgrade prefect

. 4. Inspect Logs: Review the logs for any additional context or errors that might provide more insight into the issue. 5. Check for Corruption: If the token was stored or transmitted, ensure it wasn't altered during the process. Given that no specific issues were found in the Prefect GitHub repository related to this error, these general troubleshooting steps should help you identify the root cause. If the problem persists, consider reaching out to the Prefect community or support for further assistance. For more detailed troubleshooting, you can refer to the Prefect Troubleshooting Guide.