So, we are currently encountering this problem on our website at. I’m not sure what the problem is, but if someone could help us out, it would be great :-)
I’ve provided the website info in the private section.
Mentioned file is not one of theme files. It is one of WordPress core file. Please try re-installing WordPress, deactivating all active plugins and re-updating the theme via FTP – kriesi.at/documentation/enfold/updating-your-theme-files/