PopUp Domination plugin crashed the backend of my site

hi, on our site, https://www.beyondlimitsmagazine.com, we used the “PopUp Domination” plugin to aks people to sign up for our mailing list after viewing 3 pages, and the cookie it uses to keep track of that was set to reset every 7 days. It worked fine at first, but then yesterday when I signed in to the admin account, there were the following error messages on the backend:

configuration by allow_url_fopen=0 in /nfs/c04/h01/mnt/66714/domains/beyondlimitsmagazine.com/html/wp-content/plugins/popup-domination/popup-domination.php on line 196

Warning: DOMDocument::load(https://www.popupdomination.com/blog/feed/) [domdocument.load]: failed to open stream: no suitable wrapper could be found in /nfs/c04/h01/mnt/66714/domains/beyondlimitsmagazine.com/html/wp-content/plugins/popup-domination/popup-domination.php on line 196

Warning: DOMDocument::load() [domdocument.load]: I/O warning : failed to load external entity “https://www.popupdomination.com/blog/feed/” in /nfs/c04/h01/mnt/66714/domains/beyondlimitsmagazine.com/html/wp-content/plugins/popup-domination/popup-domination.php on line 196

The dashboard is gone, although I can still get to most things. The only pages I have been unable to accessare the plugins page and the media library. The fron of the site is functioning normally.

The following error messages also appear at the top of the page above where the dashboard nav would normally be

Any help would be much appreciated.