Page not found issue

I got an error, when go to the url contain @@@For example: /product@abcd =@ throw error/product?category=abcd =@ access to page/product-abcd =@ go to page not found status 404In webconfig setting @pages validateRequest=@false@ clientIDMode=@AutoID@@Here is screenshoot error from page and event loghttp://prntscr.com/kklpmwhttp://prntscr.com/kklq5y