Extensions Broken in 3.1.4
From Joomla! Documentation
Some extensions that worked in 3.1.1 give a 500 error in version 3.1.4.
Versions affected
General Information
This pertains only to Joomla! version(s):- 3.1.4
What is the cause
Not specified
What is the fix
If you have this problem you can install this hotfix just as you would a normal extension. Use Extension Manager → Install
General Information
This is fixed in 3.1.5, upgrade your Joomla! version.
For any other extension related issues, please contact the extension developer for information.