Hi,
I was getting the below error while using DiscoveryService

The reason was I was unknowingly using RetrieveOrganizationRequest class instead of RetrieveOrganization(s)Request class.
http://social.microsoft.com/Forums/is/crmdevelopment/thread/d5d00302-8f7b-4efc-873b-c54b3e29749d
Hope it helps.
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Sweet, thanks for the tip. This just saved me from what I can only assume would’ve been a long and frustrating debugging session.
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