rev slider crashing

My rev slider stop working, deactivated all plugins .. deleted reinstalled ..
updated betheme still no luck
It fails to show the slider on any page.

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.3.2
Current theme: Betheme Child (version 1.6.1.2)
Current plugin: Slider Revolution (version 6.2.2)
PHP version 7.3.13



Error Details
=============
An error of type E_ERROR was caused in line 15 of the file /home2/finnrnmy/public_html/zakirmahomedy/wp-content/plugins/revslider/admin/views/modals-copyright.php. Error message: Uncaught Error: Call to undefined method RevSliderFunctions::get_addition() in /home2/finnrnmy/public_html/zakirmahomedy/wp-content/plugins/revslider/admin/views/modals-copyright.php:15
Stack trace:
#0 /home2/finnrnmy/public_html/zakirmahomedy/wp-content/plugins/revslider/admin/includes/shortcode_generator/shortcode_generator.class.php(229): 

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