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load report failed error - with formatted crystal reports, iis6 and asp.net.net

Error:  load report failed This error troubled us a lot in reports deployment on 64bit server with IIS 6   and took at least 5 hours continuous focus to fix.  We tried to troubleshoot by giving all permissions to the iis user to application folder, application pool recycled,   server reboot and even compared all deployment files in the problem environment with the one in application working environment. But we are failed to fix. 

Basic Differences between Abstract class and Interface

 Behaviour Abstract Class Interface Multiple Inheritance Not Possible Possible Inheritance Chain(of same type) Possible Not Possible (does not fall under the inheritance chain of same type) Concrete Functionality Possible Not Possible Private Members Not Possible Possible Type can be declared as method input parameter Not Possible (because instance could not be created) Possible (acceptable with fully implemented instance is being passed) Structs can implement Not Possible Possible Every member needs to be implemented No Yes