Critical Error after switching from PHP version 7.4 to 8.x

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Our site no longer works in the internal area after switching from PHP version 7.4 to 8.x, although all modules / theme / wordpress core are up to date. as soon as you switch, logged-in users receive a critical page error. however, not the white screen off death as usual, but a page error within the boxed layout.

Is it possible that the latest version of ultimate member is not compatible with PHP 8?

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

 

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