Error message

Sir,
I would like to inform that I could not access the Products module in the virtuemart section. I get the following message:

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at webmaster@shafafurnitureltd.com to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Kindly advise

You damaged something

Sir,
Is there any solution?

Re-install, or if you had too much work we can only offer to repair your site for fee.