website down

getting the following error message:
Help to fix, please?

Warning: include_once(/home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryPro.php): failed to open stream: No such file or directory in /home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryFree.php on line 963

Warning: include_once(): Failed opening '/home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryPro.php' for inclusion (include_path='.:/usr/local/php74/pear') in /home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryFree.php on line 963

Fatal error: Uncaught Error: Class 'CMTT_Pro' not found in /home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryFree.php:978 Stack trace: #0 /home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryFree.php(21): CMTT_Free::initFiles() #1 /home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/enhanced-tooltipglossary.php(96): CMTT_Free::init() #2 /home/customer/www/insurevents.com/public_html/wp-settings.php(428): include_once('/home/customer/...') #3 /home/customer/www/insurevents.com/public_html/wp-config.php(97): require_once('/home/customer/...') #4 /home/customer/www/insurevents.com/public_html/wp-load.php(50): require_once('/home/customer/...') #5 /home/customer/www/insurevents.com/public_html/wp-blog-header.php(13): require_once('/home/customer/...') #6 /home/customer/www/insurevents.com/public_html/index.php(17): require('/home/customer/...') #7 {main} thrown in /home/customer/www/insurevents.com/public_html/wp-content/plugins/enhanced-tooltipglossary/glossaryFree.php on line 978

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