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Q: 

What does the error Client.Data.UnderFlow mean in an AMF transaction?

During RubyAMF and AS3 interaction, I keep getting the error "Client.Data.UnderFlow" in a NetStatusEvent.NET_STATUS on the AS3 side.

On the Ruby side I get "ActiveRecord::RecordNotFound (Couldn't find {type} without an ID)", where {type} is the defined type that I'm looking up.

A google search suggests that this issue seems to have come up a lot in a variety of different AMF scenarios, but no clear reason why it happens.

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