While I debugging, I got error like "RestclientController is undefined ". For this reference,We need to modify iis configuration.below is the solution.
Changing to classic mode wasn't an option for me (I'm using asp.net mvc). I fixed this by clicking on the application virtual directory in IIS7 and clicking on the 'Handler Mappings' section. Then 'Add Managed Handler'
Request path: Reserved.ReportViewerWebControl.axd
Type: Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Name: Reserved.ReportViewerWebControl.axd
Once this was created, it worked fine in the Integraded mode AppPool