After Auto Update To Version 5.5.3 Cannot Access Admin Section

My WP site was auto-updated to version 5.5.3. Now I can’t access the Admin section of my website. When I login to access the Admin section, I notice text at the bottom-left of the screen that says ‘allow_url_include’ is deprecated in Unknown on line 0. After entering my credentials, it spins and spins and then everything time-out and crash.

Via my search history in Google I’m able to access the Smart Forms plugin settings in the Admin section. However, if I click any of the links (in the left-hand-side menu), the same issue occurs.

Fortunately the front-end of the site is accessible to visitors but I can’t access the Admin section.

The page I need help with: [log in to see the link]

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