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boukasa
Brass Contributor
Aug 19, 2025

Excel Labs AFE - "Failed to load: There was an internal error while processing the request."

This message appears when I attempt to open AFE with my workbook. If I remove the use of my (complex) lambda from the book, save, close, and reopen, I can open the AFE. Once I use the formula in the sheet again, I get the message (the lambda does calculate and display the correct result). 

Is there any way to get more information about the cause of the issue?

2 Replies

  • Take this:

     

    - Try Disabling the Formula Debugger: If you're using the debugger, turn it off and see if AFE loads properly.
    - Break Down the Formula: Temporarily simplify or modularize your LAMBDA into smaller named functions. This can help isolate which part is causing the issue.
    - Check for Updates: Make sure you’re running the latest version of Excel and Excel Labs. Some bugs have been addressed in recent builds.

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