Error Details
=============
An error of type E_ERROR was caused in line 373 of the file /home1/fivtwoe4/public_html/wp-content/plugins/tabs/includes/meta.php. Error message: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /home1/fivtwoe4/public_html/wp-content/plugins/tabs/includes/meta.php:373
Stack trace:
#0 /home1/fivtwoe4/public_html/wp-content/plugins/tabs/includes/meta.php(373): implode(Array, ';')
#1 /home1/fivtwoe4/public_html/wp-admin/includes/template.php(1395): meta_boxes_tabs_input(Object(WP_Post), Array)
#2 /home1/fivtwoe4/public_html/wp-admin/edit-form-advanced.php(688): do_meta_boxes(Object(WP_Screen), 'normal', Object(WP_Post))
#3 /home1/fivtwoe4/public_html/wp-admin/post.php(206): require('/home1/fivtwoe4...')
#4 {main}
thrown
Content and CSS sections are completely blank—no content is show, not even the editor window.

Hi, sorry to hear that you lost the previous data. You can download the older version Tab plugin from the link given below. Then the older data will automatically populate.
let us know the progress.
Download the older version link-
https://wordpress.org/plugins/tabs/advanced
Download help screenshot link-
https://i.imgur.com/sdTATNX.png