A 500 Error is often caused due to an issue with Permissions. Check out the following guide on setting proper permissions using Cyberduck (you will want to research permissions for your particular FTP client):
http://webmaster.iu.edu/chmod/chmod_mac.shtml
Additionally, you can check out the error log and get more information on what is causing the error. If you have an administrator gui provided to you by your host, that will be a good place to check. Here is an example video for cPanel (you will want to check with your host for how to access this report on your specific admin. interface):
http://www.youtube.com/watch?v=pzO1UNHZjZo
It appears that your host (bigrock.in) provides cPanel and Linux hosting, so the above video should be helpful. If not, consider contacting your host by submitting a support ticket here:
http://support.bigrock.com/index.php?/Tickets/Submit
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