I have one team site in sharepoint. I have enabled and disabled Publishing feature for the site multiple number of times. So when i go to the site actions-Site settings- Modify Navigation Menu is disabled. and when i click on Navigation under Look and Feel it is throwing an error "Updates are currently disallowed on GET requests. To allow updates on GET,Set the 'AllowUnsafeupdates' property on SPWeb". Any Idea? Please help me to resolve this issue.

Hi Sandeep, Thanks for your response. We are not using any custome code for this site.