I am working on some sort of blogging platform in php with a nice material design lite frontend. However I have a page that dynamically loads the content, it works fine in the root directory, but not in my admin directory. I hope you can spot some kind of error/typo in my code, I know the error is in the menu-start file, since disabling it enables loading.
Here is the page that loads the code and here is the menu-start page
If you need any other code, please ask