The website of my small publishing house has been running smoothly with Backdrop CMS for several years.
But today I have a big problem:
Without doing anything special (just writing an article), the public part of the site no longer works.
I looked in the reports, I have this error message:
Error: Undefined constant "pixel_density" in adaptive_image_resolution() (line 249 of /home/.../web/zinechdm_backdrop/modules/adaptive_image/adaptive_image.module).
The address of the site to realize the problem: https://zine.lechantdesmuses.fr/
I am really very annoyed. If anyone could help me out, that would be really great.
Thanks for your attention.
here is a screenshot of the current state of the frontend (only the site logo remains!)