In the Dynamics AX 2009 Setup when you are trying to install the Dynamics AX 2009 Reporting Extensions for Microsoft SQL Server Reporting Services you might run into the following error message:

An error occurred during setup of Reporting extensions.
Reason: Invalid URI: The URI is empty.
System.UriFormatException: Invalid URI: The URI is empty.

At the same time in the DynamicsSetup.txt you can find the following Exception:

Reason: Invalid URI: The URI is empty.
System.UriFormatException: Invalid URI: The URI is empty.
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
at System.Net.WebRequest.Create(String requestUriString)
at Microsoft.Dynamics.Setup.ReportsServerInstaller.VerifyStateOfReportServer(String instanceName)
at Microsoft.Dynamics.Setup.Driver.RunReportingSetupManagerDeploy()

If you run into this error, you Microsoft SQL Server Reporting Services were not correctly configured to work for Dynamics AX 2009! Please follow the Microsoft Dynamics AX 2009 Installation Guide Configure Reporting Services section (page 64) to configure the Microsoft SQL Server Reporting Services and try to install the Dynamics AX 2009 Reporting Extensions again.