I am getting fatal error after updating the php version from 7.4 to 8.1

Fatal error: Uncaught Error: Attempt to modify property "admin_notices" on null in /home/healt637/public_html/wp-content/plugins/dentalpress-options/framework/inc/class.redux_filesystem.php:28 Stack trace: #0 /home/healt637/public_html/wp-content/plugins/dentalpress-options/framework/inc/class.redux_filesystem.php(46): Redux_Filesystem->__construct() #1 /home/healt637/public_html/wp-content/plugins/dentalpress-options/framework/inc/class.redux_filesystem.php(314): Redux_Filesystem::get_instance() #2 /home/healt637/public_html/wp-content/plugins/dentalpress-options/framework/framework.php(51): require_once('/home/healt637/...') #3 /home/healt637/public_html/wp-content/plugins/dentalpress-options/dentalpress-options.php(26): require_once('/home/healt637/...') #4 /home/healt637/public_html/wp-content/plugins/dentalpress-options/dentalpress-options.php(66): DentalPress_Options->__construct() #5 /home/healt637/public_html/wp-settings.php(473): include_once('/home/healt637/...') #6 /home/healt637/public_html/wp-config.php(92): require_once('/home/healt637/...') #7 /home/healt637/public_html/wp-load.php(50): require_once('/home/healt637/...') #8 /home/healt637/public_html/wp-admin/admin.php(34): require_once('/home/healt637/...') #9 /home/healt637/public_html/wp-admin/plugins.php(10): require_once('/home/healt637/...') #10 {main} thrown in /home/healt637/public_html/wp-content/plugins/dentalpress-options/framework/inc/class.redux_filesystem.php on line 28

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Any updates ?