> ## Documentation Index
> Fetch the complete documentation index at: https://ngrok.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Error 638

## ERR\_NGROK\_638

Your account is not allowed to create credentials with pre-computed tokens. To create a new credential, omit pre-computed token field and let ngrok generate one for you. Its value will be available as part of the response.

## Further help

If you're having trouble resolving this error, please reach out to [support@ngrok.com](mailto:support@ngrok.com?subject=Help%20with%20ERR_NGROK_638)