Class ‘MetaSlider_Widget’ not found plus

After update of MetaSlider, got wordpress email saying errors. It actually works fine on the website. However the error log says:
Uncaught Error: Class ‘MetaImageSlide’ not found in /www/wp-content/plugins/ml-slider/ml-slider.php:378″
?
?PHP Fatal error: Uncaught Error: Class ‘MetaSlider_Widget’ not found in /wordpress/wp-includes/class-wp-widget-factory.php:61

From the email:

Error Details
=============
An error of type E_ERROR was caused in line 378 of the file /www/wp-content/plugins/ml-slider/ml-slider.php. Error message: Uncaught Error: Class 'MetaImageSlide' not found in /www/wp-content/plugins/ml-slider/ml-slider.php:378
Stack trace:
#0 /www/wp-content/plugins/ml-slider/ml-slider.php(98): MetaSliderPlugin->register_slide_types()
#1 /wordpress/wp-includes/class-wp-hook.php(303): MetaSliderPlugin->setup('')
#2 /wordpress/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(Object(IOWD), Array)
#3 /wordpress/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#4 /wordpress/wp-settings.php(444): do_action('plugins_loaded')
#5 /www/wp-config.php(110): require_once('/wordpress/wp-s...')
#6 /wordpress/wp-config.php(5): require('/www/wp-config....')
#7 /wordpress/wp-load.php(50): require_once('/wordpress/wp-c...')
#8 /wordpress/wp-admin/admin-ajax.php(22): require_once('/wordpress/wp-l...')
#9 {main}
  thrown

MetaSlider version 3.26.0
WordPress version 5.8.3
Current theme: Vantage (version 1.18.1)
Current plugin: MetaSlider (version 3.25.2) [which is odd, as it is shown as 3.26.0]
PHP version 7.4.27

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