Connecting Plant 3D 2014 to Vault

When connecting Plant 3d 2014 to Autodesk Vault, you may get an error like this:

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The issue is from Plant 3D 2014 working off of a different Autodesk.Connectivity.WebServices than AutoCAD 2014. To resolve the issue, I copied the dll (Autodesk.Connectivity.WebServices.dll) from C:\Program Files\Autodesk\AutoCAD 2014 (making a backup) to C:\Program Files\Autodesk\AutoCAD 2014\PLNT3D\.

At that point, I was able to create and use a new project in AutoCAD Plant 3D 2014 with Vault.