Error after upgrading to a higher PHP version

Hello,
I wanted to switch the website https://www.glas-und-farben.de from PHP 7.2 to PHP 7.3 or 7.4, which I did on the provider site.
Then when I clicked on one of the photos on the start page under "Glass gallery", I was not redirected to the subpage, but received the following error:

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /homepages/24/d285625510/htdocs/glas-und-farben/wp-content/plugins/revslider/includes/operations.class.php on line 2854

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /homepages/24/d285625510/htdocs/glas-und-farben/wp-content/plugins/revslider/includes/operations.class.php on line 2858

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /homepages/24/d285625510/htdocs/glas-und-farben/wp-content/plugins/revslider/includes/output.class.php on line 3708

Warning: Cannot modify header information - headers already sent by (output started at /homepages/24/d285625510/htdocs/glas-und-farben/wp-content/plugins/revslider/includes/operations.class.php:2854) in / homepages / 24 / d285625510 / htdocs / glas-und-Farbe / wp-includes / pluggable.php on line 1281

Warning: Cannot modify header information - headers already sent by (output started at /homepages/24/d285625510/htdocs/glas-und-farben/wp-content/plugins/revslider/includes/operations.class.php:2854) in / homepages / 24 / d285625510 / htdocs / glas-und-Farbe / wp-includes / pluggable.php on line 1284

Why is it?

Thanks

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