JSON Error

I have an issue with EasyBlog, whenever I try to save a post I get an error, the same error every time and I started to get this on a previous version, so upgraded to the new version in the hope it would resolve, but it does not seem to have resolved it. I have then tried installing on 4 different Joomla websites that I run just to see if it is an issue with the website, but it does the same on all of them.

The error I am getting is: Unexpected token < in JSON at position 0

Is this something that can be simply fixed?

Thanks
Nick