Reply To: Updated to last version and can't open admin page

Hi Again, after contacting with Siteground they had to go back to the previous version of BAsel as the last version isn’t working. They say the latest version is missing some basic files that prevent it from working properly.
These are the errors they got:

[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(): Failed opening ‘widgets/class-user-panel-widget.php’ for inclusion (include_path=’.:/usr/local/php56/pear’) in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 18
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(widgets/class-author-area-widget.php): failed to open stream: No such file or directory in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 19
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(): Failed opening ‘widgets/class-author-area-widget.php’ for inclusion (include_path=’.:/usr/local/php56/pear’) in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 19
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(widgets/class-banner-widget.php): failed to open stream: No such file or directory in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 20
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(): Failed opening ‘widgets/class-banner-widget.php’ for inclusion (include_path=’.:/usr/local/php56/pear’) in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 20
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(widgets/class-instagram-widget.php): failed to open stream: No such file or directory in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 21
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(): Failed opening ‘widgets/class-instagram-widget.php’ for inclusion (include_path=’.:/usr/local/php56/pear’) in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 21
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(widgets/class-static-block-widget.php): failed to open stream: No such file or directory in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 22
[22-Jan-2018 18:18:04 UTC] PHP Warning: include_once(): Failed opening ‘widgets/class-static-block-widget.php’ for inclusion (include_path=’.:/usr/local/php56/pear’) in /home/aseisman/public_html/wp-content/themes/basel/inc/widgets.php on line 22
[22-Jan-2018 18:18:05 UTC] PHP Fatal error: Class ‘BASEL_WP_Nav_Menu_Widget’ not found in /home/aseisman/public_html/wp-includes/class-wp-widget-factory.php on line 100

Please advise how we should proceed.
Thanks
charo