Good day!
I installed the sj_flooring template via quickstart. Installed version is 3.9.0.
Everything was fine.
Before installing joomla 3.9.1 everything was clean, all extensions were updated.
After upgrading to version 3.9.1, an error popped up in the module Sj Gallery Pro:

Warning: require_once(/home/httpd/vhosts/ckzc.ru/httpdocs/libraries/joomla/filesystem/folder.php): failed to open stream: No such file or directory in /home/httpd/vhosts/ckzc.ru/httpdocs/modules/mod_sj_gallery_pro/core/helper.php on line 12

Fatal error: require_once(): Failed opening required '/home/httpd/vhosts/ckzc.ru/httpdocs/libraries/joomla/filesystem/folder.php' (include_path='.:/usr/share/pear:/usr/share/php') in /home/httpd/vhosts/ckzc.ru/httpdocs/modules/mod_sj_gallery_pro/core/helper.php on line 12

I wrote a ticket also and will come back if it is answered.

i faced white screen in my home page after updating Joomla from 3.8.8 to 3.9.13
but my admin panel is working properly
Fatal error: require_once(): Failed opening required '/.../my website/libraries/joomla/filesystem/folder.php' (include_path='.:/opt/cpanel/ea-php72/root/usr/share/pear') in /.../my website/modules/mod_sj_gallery_pro/core/helper.php on line 12

Warning: require_once(/.../my website/libraries/joomla/filesystem/folder.php): failed to open stream: No such file or directory in /.../my website/modules/mod_sj_gallery_pro/core/helper.php on line 12
can any body help?

Dear,

Please open the file: /modules/mod_sj_gallery_pro/core/helper.php on line 12
We're sorry for this late. comments it's

Thanks