Fatal error: Class 'FilesystemIterator' not found

Have used before on other sites ok.. on new site getting this error?

Fatal error: Class ‘FilesystemIterator’ not found in /websites/123reg/LinuxPackage22/la/ng/le/langleyhorticulture.co.uk/public_html/wp-content/plugins/wp-clone-by-wp-academy/lib/functions.php on line 1088

Plus see this as a warning:

Warning: Invalid argument supplied for foreach() in /websites/123reg/LinuxPackage22/la/ng/le/langleyhorticulture.co.uk/public_html/wp-content/plugins/wp-clone-by-wp-academy/lib/view.php on line 274

https://ww.wp.xz.cn/plugins/wp-clone-by-wp-academy/