A bug can occur in Joomla when Google recaptcha is being loaded in multiple places on a site. The error message "Empty Solution Not Allowed,” most commonly occurs when trying to edit content through frontend editing. The error shows after hitting the SAVE button. The easiest solution is to simply disable the recaptcha feature from frontend editing.

Many security tools and blogs suggest setting the open_basedir in the php.ini file.  The open_basedir directive "Limits the files that can be accessed by PHP to the specified directory-tree, including the file itself. ... When the file is outside the specified directory-tree, PHP will refuse to access it." *

However, it can often trigger the error:

JFolder::create: Path not in open_basedir paths

In order to solve this, you have three options: