Error after updating Word Press theme

Hi everyone,

Before starting I need to say I am new to this entire subject area so patience is highly appreciated as I migh ask some obvious and basic questions ??

I use theme Avada to run my site. Today I started to update my theme via Filezilla and I dunno but it went ok. I kept on getting a message about a target file and it came a hundred times and every time i cancelled it. Anyways after the theme was copied into the directory ( i hope my observation was correct) I activated the theme on the site and got the error message I get the following error when i try to go to my site. I cant seem to log into my site even through wp-login. I dunno whats wrong or what I have done.

Warning: include_once(/home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/includes/plugins/multiple_sidebars.php): failed to open stream: No such file or directory in /home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/functions.php on line 34

Warning: include_once(): Failed opening ‘/home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/includes/plugins/multiple_sidebars.php’ for inclusion (include_path=’.:/usr/local/lib/php’) in /home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/functions.php on line 34

Warning: require_once(/home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/includes/plugins/post-link-plus.php): failed to open stream: No such file or directory in /home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/functions.php on line 35

Fatal error: require_once(): Failed opening required ‘/home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/includes/plugins/post-link-plus.php’ (include_path=’.:/usr/local/lib/php’) in /home/ashwazeer/public_html/wp-content/themes/themeforest-2833226-avada-responsive-multipurpose-theme-wordpress-theme/Avada/functions.php on line 35

Please help me with this.