Unable to Load Tooltip Content Error

I am getting this "unable to load tooltip content" error for my notification dropdown in my site. It shows unread notification counts but when I click on it, this unable to load error shows. I tried logging out and logging in again and it didnt resolve it. I tried resetting the browser cache, still same. I noticed this happening to my admin account. The other account seems to be working fine so far. When I click on the notification button, the chrome console shows the following error:

POST http://mysite.com/?option=com_easysocial&_ts=1415540959914 500 (Internal Server Error) jquery.js:9680

send 					jquery.js:9680

jqXHR.send 				jquery.js:9214

(anonymous function) 	utils.js:1808

(anonymous function) 	utils.js:494	

I also tried it from Firefox, the same issue was there. The Firebug showed this:

[HTTP/1.1 500 Internal Server Error 163ms]

My Browsers:
Google Chrome 38.0.2125.1111 m
Firefox 33.0.3


NOTE: This error is not in the site details I have here. Hopefully the above info gives you an idea on what might causing this issue for me. Let me know if you need further info.