May be you should not accept my answer as this has not resolved your issue.
Check the atlassian-jira.log, search for 'modified files' and find if you have customized any files. Haven't seen such a file before.
And most important, what does the file contain? Can you post a portion of the file?
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events