Problem report generate by localhost

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ASP.NET

I have a project which runs sucessfuly while debuging but there is still problem while running on localhost by IIS. Please can u help to solve this?
Error in File CrsItem {AA3D84EE-4409-42CA-8793-9D4EFC1F7F0A}.rpt:
Access to report file denied. Another program may be using it.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Runtime.InteropServices.COMException: Error in File CrsItem {AA3D84EE-4409-42CA-8793-9D4EFC1F7F0A}.rpt:
Access to report file denied. Another program may be using it.

Source Error:


Line 34: rptDoc.PrintOptions.PaperOrientation = CrystalDecisions.Shared.PaperOrientation.DefaultPaperOrientation;
Line 35: // rptDoc.Load(Server.MapPath("../Pages/Test.rpt"));
Line 36: rptDoc.Load(Server.MapPath("../Pages/CrsItem.rpt"));
Line 37: //set dataset to the report viewer.
Line 38: rptDoc.SetDataSource(dt);