What could be causing this error:
$ sudo tail -n 100 /var/log/apache2/error.log\'
[Wed Dec 29 15:20:03 2010] [error] [client 220.181.108.181] mod_wsg
I've found the same problem with my python web app in Digital ocean and after checking the log file seriously I've discovered that It was a problem with my Database mysql ! The problem was due to the fact that I was running out storage (RAM) So check those question and solve the problem!
`For Mysql
And this
Hope It will help