The current p5-Dancer 1.3512 is incompatible with the latest version of textproc/p5-YAML, which is 1.30.
The first item listed in the changelog for the 1.3513 release is to fix that problem, and has been available since January 2020.
See https://metacpan.org/release/Dancer for more details.
Created attachment 220120 [details]
update to 1.3513
Happy to commit this on your behalf.
A commit references this bug:
Date: Mon Nov 30 23:12:30 UTC 2020
New revision: 556686
Update to 1.3513
Submitted by: email@example.com
Approved by: maintainer (via private email)