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Error 1101

Error 1101: Rendering error

This error indicates a rendering issue.

Common cause

This error typically occurs when a Cloudflare Worker encounters a runtime JavaScript exception.

Debugging

To identify the specific JavaScript exception:

  1. Check your Workers logs in the Cloudflare dashboard under Workers & Pages > Your Worker > Logs.
  2. Review the Workers code for potential runtime errors such as:
    • Undefined variables or functions
    • Type errors
    • Promise rejections
    • Network request failures
  3. Test the Worker locally with sample requests to reproduce the error.
  4. Refer to Workers error handling for more details on debugging Workers.

Resolution

Fix the JavaScript exception in your Workers code. If you need assistance, provide appropriate issue details to Cloudflare Support, including:

  • The Ray ID from the error page
  • The Worker name
  • Recent changes to the Worker code
  • Steps to reproduce the error
  • Error 1102 - Workers CPU time limit exceeded
  • Error 500 - Internal server error (can be caused by Workers exceptions)