problems with wp in sub-folder

Hi! My wp folder structure is like the following:

index.php
—content/
  —plugins/
  —themes/
—core/
  —wp-admin/
  —wp-includes/

this causes an error with your plugin:

<b>Fatal error</b>:  require(): Failed opening required '/site/wp-includes/ms-functions.php' in 'site/content/plugins/shariff/backend/index.php' on line 50

Any ideas to solve this dynamically?

P.s.: First, of course enjoy your holidays 🙂

https://wordpress.org/plugins/shariff/