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When you try to convert RDLC Report from VB.NET 2005/2008 to VB.NET 2010, you will encounter an error “The definition of the report 'Main Report' is invalid”.
This error is caused by a wrong version on the Project Reference. The work around on this is to remove the two references:
Microsoft.ReportViewer.Common
Microsoft.ReportViewer.WinForms
Here’s the screenshot of the two references that needs to be removed.
After you remove the two references, add the correct version which is version 10.0.0.0
On the solution explorer, right click References and click “Add reference”.
Hope this help.
This error is caused by a wrong version on the Project Reference. The work around on this is to remove the two references:
Microsoft.ReportViewer.Common
Microsoft.ReportViewer.WinForms
Here’s the screenshot of the two references that needs to be removed.

After you remove the two references, add the correct version which is version 10.0.0.0
On the solution explorer, right click References and click “Add reference”.

Hope this help.