Error Message When Using BackupBuddy Sind WP 5.7.1

Hi Guys,

Since WordPress 5.7.1, whenever you try to do a complete backup using iThemes BackupBuddy the below message pops up, if you click ok, the backup does go ahead. This error has only popped up since WP 5.7.1 and does not pop up an any of my other sites with the MainWP Child Plugin, it only pops up on my main site where the MainWP Dashboard is installed, here is the error message, thanks guys… ??

Error #82389: A javascript error occurred which may prevent the backup from continuing. Check your browser error console for details. This is most often caused by another plugin or theme containing broken javascript. See details below for clues or try temporarily disabling all other plugins.

Details: ‘Uncaught TypeError: jQuery(…).accordion is not a function’.
URL; ‘https://mydomain.co.uk/wp-includes/js/jquery/jquery.min.js?ver_3.5.1’.
Line: ‘2’.