​Fail to render the page.

It's a `n-tire` web HRM application develop in 2013.About 2 month ago we upgrade `crystal report` to 13.0.21.2533 and it's works fine and smooth. From today we have an issue with all reports and it's says > [Error: Fail to render the page] We taken below actions, 1) We copied `"aspnet_client"` folder from `wwwroot` folder to `IIS` folder. Nothing happened. Sometimes error not showing just showing blank white page. What should i do?