Crystal Reports Cannot find KeycodeV2.dll, or invalid keycode

Message

   Hi,
First of all i appreciate your great help.
We are getting following error.
Cannot find KeycodeV2.dll, or invalid keycode

Current server details:
We have crystal reports version 9.1.0.0 installed in Windows Server 2003 R2 Standard Edition and being used this in our visual studio project which is in framework 1.1. The crystal reports in the project are working good.

Migrating to new server, here are the details:
Windows 2008 Server Standard Edition and .NET framework 4.0.
We just upgraded the asp.net project from framework 1.1 to 4.0 and moved the code to the new server. We didn't do any crystal report installation in the new server. 
When we try to run the reports, we are getting following error.

Cannot find KeycodeV2.dll, or invalid keycode. 
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: CrystalDecisions.CrystalReports.Engine.InternalException: Cannot find KeycodeV2.dll, or invalid keycode.
Source Error: 

Line 23:     
Line 24:     Public Sub New()
Line 25:         MyBase.New
Line 26:     End Sub
Line 27:     

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 
Any help highly appreciated.
Thanks in advance

Edited by rdevarasetty - 08 Dec 2011 at 8:49am