SSRS 2008 reporting service proxy issues

Hi friends,

We are facing the following issues after upgrading web reference to ReportService2010.asmx reporting service.

1. The type or namespace name 'ReportParameter' could not be found (are you missing a using directive or an assembly reference?)   
2. The type or namespace name 'ItemTypeEnum' could not be found (are you missing a using directive or an assembly reference?)    

Have any of you faced the same issues while upgrading the service reference?  Are there any alternative classes for the same. 

One alternative to the error no. 2 has been given in the following link.

http://www.deeptraining.com/litwin/devcnxfall10/Litwin_SQL_SBI305_ProgrammingReportingServices.pdf

But I am not able to find solution for error 1.  Please provide your views.

Thanks.

Murtaza