Brizy WP - Fatal Error

Haven't touched my daughter's fashion website for a while but she has a job interview on Monday and they want to view her website (built with Brizy WP) but for some reason, she's getting the following error when she tries to view the site:

Fatal error: Uncaught Error: Class 'Brizy_Shortcode_PostField' not found in /homepages/45/d827438617/htdocs/app827438812/wp-content/plugins/brizy-pro.old/content/placeholders/excerpt.php:33 Stack trace: #0 /homepages/45/d827438617/htdocs/app827438812/wp-content/plugins/brizy-pro.old/content/placeholders/excerpt.php(13): BrizyPro_Content_Placeholders_Excerpt->get_the_excerpt(Object(WP_Post)) #1 /homepages/45/d827438617/htdocs/app827438812/wp-content/plugins/brizy/content/placeholders/simple.php(37): BrizyPro_Content_Placeholders_Excerpt->{closure}(Object(Brizy_Content_Context), Object(Brizy_Content_ContentPlaceholder)) #2 /homepages/45/d827438617/htdocs/app827438812/wp-content/plugins/brizy/content/placeholder-replacer.php(51): Brizy_Content_Placeholders_Simple->getValue(Object(Brizy_Content_Context), Object(Brizy_Content_ContentPlaceholder)) #3 /homepages/45/d827438617/htdocs/app827438812/wp-content/plugins/brizy-pro.old/content/placeholders/post-loop.php(47): Brizy_Content_PlaceholderReplacer->getContent(Array, '<div cla in /homepages/45/d827438617/htdocs/app827438812/wp-content/plugins/brizy-pro.old/content/placeholders/excerpt.php on line 33

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Ive updated all the plugins but still can't get it to work. My daughter isn't particularly tech-savvy so could you help explain how to fix it, please?

Thanks