Site doesn’t work after WordPress update

After updating WordPress to newest version my client’s website stopped working. Here’s the error:

Fatal error: Uncaught Error: Class ‘WPCF7_FormTag’ not found in /home/kwiaciarnia/public_html/wp-content/plugins/contact-form-7/includes/shortcodes.php:94 Stack trace: #0 /home/kwiaciarnia/public_html/wp-content/plugins/cf7-calendar/cf7-calendar.php(307): include() #1 /home/kwiaciarnia/public_html/wp-settings.php(377): include_once(‘/home/kwiaciarn…’) #2 /home/kwiaciarnia/public_html/wp-config.php(98): require_once(‘/home/kwiaciarn…’) #3 /home/kwiaciarnia/public_html/wp-load.php(37): require_once(‘/home/kwiaciarn…’) #4 /home/kwiaciarnia/public_html/wp-blog-header.php(13): require_once(‘/home/kwiaciarn…’) #5 /home/kwiaciarnia/public_html/index.php(17): require(‘/home/kwiaciarn…’) #6 {main} thrown in /home/kwiaciarnia/public_html/wp-content/plugins/contact-form-7/includes/shortcodes.php on line 94

What should I do? Mind you I had to update from WordPress 4.9…

• This topic was modified 3 years, 4 months ago by olgalokomotywa.