I have a module named Timeline. When I navigate to Content > Timeline & click on edit button of an item I get the following error: "The page at localhost:xx says Return Code 0"
Image of browser's console error is attached:
Also, now I am unable to open the edit window of this content, however the window was opening a few moments earlier with this error being thrown randomly, but now it is not opening at all. The Sitefinity version written on the backend's footer is 7.2. The webiste is run through a published version deployed on local IIS 7+ with MSSqlServer2012 (local). I don't have access to code files of this project. Only the dlls are there. This project is built by someone else & I am just getting used to it and Sitefinity in general.
I have read this thread: http://www.sitefinity.com/developer-network/forums/bugs-issues-/return-code-0-primary-key-violation
Upgrading to some other version is not possible at the moment. Also the version is 7.2 which basically should be good according to the above thread. This issue was in Version 4 or so as far as I understand. I scrolled through error.log file, but there I couldnt see an entry with today's timestamp. How can I get the real error behind this. Kindly help. I am new to this.