JUser Error - Please take a look

I am using the latest version of EasyBlog and when I make a post and publish it I get the error displayed in the attached screen shot. I do not know what a JUser is and therefore I do not know what to troubleshoot. Can you access my site with the info in the Site Details tab below and make a post and see if you can recreate the issue? This came about as we were solving an issue with the autoposting to Facebook, Twitter, and LinkedIn. Could this error have something to do with the settings related to the autoposting? The site is new and there are only two blog posts so far. Do whatever you need to do to resolve the error.
Michael Leavitt - Orem, Utah