Improve Subpackage Errors

[victoriaplummer]

How important is this?

P1 - High (Strongly needed)

What's the feature?

-Feature - Improve existing errors when generating Fern docs.
-Why - Every now and then I run into a "Subpackage Error" when generating docs, but it's not clear what is triggering the error. I know it's an issue in my .yml of my version config file, but I have multiple versions and a lot of endpoints and have to hunt and peck through each to understand what's triggering it. This is a major distraction and would much rather the error tell me which endpoint wasn't loaded because of it - or where in version.yml the error occurs. At the very least, which version is erroring.

ERROR 2025-03-03T16:07:19.732Z [docs]:         Subpackage undefined not found in 8b249146-7cdb-475b-9843-254b6a5110a6```

[dannysheridan]

Agree that this error is frustrating. Thanks for reporting here. Possible to link the branch/commit you were working off of?

Update: here's the commit that fixed it