What is it you have tried? It sounds like the user ([IIS APPPOOL\AmazonWorld]) does not have permission to access the folder and/or report on your SSRS server. Have you given them permissions to access SSRS in the Web Portal, or added them to a AD group that does have permissions?
I cannot access localhost/reports , therefore I cannot give access to specified user. My localhost/report page is showing error page.
If you can't access the reports either, who can? They'll need to set up the permissions.
Hahahahaha, I think you didn't understand the matter I want to share. My reports are ready, I have done the codebehind.cs, but when I try to run the reports on browser, this very error occurs. As I have mentioned a screen shoot to highlight the error.