Report Viewer

I am trying to create a new Data Source in Local Report Viewer.  However after I paste the Report Viewer, I can click on and choose report name. But I cannot choose Data Source.  When I click on Choose Data Source Box comes up and is blank. Any Ideas?
Secondly, I'm getting the following errors when I try to run my program with A local report in solution.
Errors:

Error 1 'ReportDataSource' is ambiguous in the namespace 'Microsoft.Reporting.WebForms'. C:\Users\MikeH\AppData\Local\Temp\Temporary ASP.NET Files\trpermits\21a5c739\75d84ebc\App_Web_4ph3kgub.0.vb 145  Error 2 'ReportDataSource' is ambiguous in the namespace 'Microsoft.Reporting.WebForms'. C:\Users\MikeH\AppData\Local\Temp\Temporary ASP.NET Files\trpermits\21a5c739\75d84ebc\App_Web_4ph3kgub.0.vb 146  Error 3 'ReportDataSourceCollection' is ambiguous in the namespace 'Microsoft.Reporting.WebForms'. C:\U ...