The resource cannot be found on web form when using crystal reports and after deployment

every other form is working fine but one which has crystal report First asking for server's username and password when i provide username password then it show this error Server Error in '/Reports' Application. The resource cannot be found.

my application root folder has full rights for users 'everyone' ,iuser,iusers_iis.... admin ,and the account which i am using .

i checked, the resource exists ,I browsed the .aspx file from iis then hit browse it should be opened in browser even then it shows resource cannot be found.

i have used asp.net website as project but if i run my website from visual studio it works fine and no prompting for username and password of my server.

any help is appreciated.