Recently I was setting up a Visual Studio 2010 solution on a client’s environment in order to perform some development work.  In this case I was performing development that required use of some Project Server web services.  In the Visual Studio solution I easy enough navigated right-click on project and selected Add Web Reference (see below).

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In the resulting dialog box I click on the Web services on the local machine link (project server is installed on the development machine).   When I did I received the error below:

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After some research I decided to start Visual Studio 2010 as an Administrator:

 

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This time, I had success!

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