See comment for details.
https://developer.garmin.com/connect-iq/reference-guides/jungle-reference/
This link points to https://developer.garmin.com/connect-iq/reference-guides/jungle-reference/Jungle_Reference.html#monkey-barrel-management, which doesn't exist (clicking on the link results in a 404 error).
This is kind of funny because the link is supposed to point to an anchor on the *same page* as the jungle reference guide.
Here's the relevant href attribute of the link in question:
href="Jungle_Reference.html#monkey-barrel-management"
It should probably be changed to "#monkey-barrel-management""