missing theme function.php code even reinstalled causing White Screen of death

My Website crashed due to a white screen of death after I have searched in google for the same issue I found that need to check plugins and themes, then I found there is an issue with the theme . with the following error.

 PHP Fatal error:  Uncaught Error: Call to undefined function mk_get_body_class() in /home/prixgfmz/public_html/wp-content/themes/jupiter/header.php:7
Stack trace:
#0 /home/prixgfmz/public_html/wp-includes/template.php(722): require_once()
#1 /home/prixgfmz/public_html/wp-includes/template.php(671): load_template('/home/prixgfmz/...', true)
#2 /home/prixgfmz/public_html/wp-includes/general-template.php(41): locate_template(Array, true)
#3 /home/prixgfmz/public_html/wp-content/themes/jupiter/page.php(8): get_header()
#4 /home/prixgfmz/public_html/wp-includes/template-loader.php(78): include('/home/prixgfmz/...')
#5 /home/prixgfmz/public_html/wp-blog-header.php(19): require_once('/home/prixgfmz/...')
#6 /home/prixgfmz/public_html/index.php(17): require('/home/prixgfmz/...')
#7 {main}
  thrown in /home/prixgfmz/public_html/wp-content/themes/jupiter/header.php on line 7

Then removed the same theme and reinstalled it so problem solved, the website got back.

But that same problem arrived with the same error on next day, again I reinstalled it but the problem is not solved. white screen arose with the same error and missing function.php codes inside.

Please help me with it

• This topic was modified 5 years, 8 months ago by madhukumar26.