After BeThemes 21.7 update I received "Your website has a technical problem"

Hi,
I received this error message as an email to the website https://www.rus-trockenbau.de/ after installing BeThemes 21.7,

"Your website has a technical problem"
Error details
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An error of type E_COMPILE_ERROR was caused in line 45 of the file /mnt/web504/d3/70/510458270/htdocs/wp-content/plugins/revslider/revslider.php. Error message: require_once (): Failed opening required '/mnt/web504/d3/70/510458270/htdocs/wp-content/plugins/revslider/admin/includes/loadbalancer.class.php' (include_path = '.: / Opt / RZphp73 / includes')

even though I use all new versions:
WordPress 5.4.1
BeThemes 21.7
Slider Revolution 6.2.6

In order to check whether it is due to one of the plugins, I would have to deactivate all plugins, but I do not receive a new email from WordPress. How can I find the bug?

Thanks

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