Document specification failed to load error

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#14646

Hi,
I am following the BizTalk Server 2006 tutorials by Microsoft. When I use a receive shape to receive a one-way message from a Web service, I get the following error:

Event Type: Error
Event Source: BizTalk Server 2006

Description:
There was a failure executing the receive pipeline:
\”Microsoft.BizTalk.DefaultPipelines.XMLReceive, Microsoft.BizTalk.DefaultPipelines, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35\”
Source: \”XML disassembler\”
Receive Port: \”ASN_ReceivePort\” URI: \”/b2borchestrations_webservice/B2BOrchestrations_B2BProcess_ReceiveASN_Port.asmx\”
Reason: The document specification <B2BSchemas.AdvancedShipNotice> from assembly <B2BSchemas, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f5f7841d15c6dc86> failed to load. Verify the schema for this document specification is deployed and is in the Global Assembly Cache.

This receive port is a port of the orchestration exposed as a Web service. I tried to undeploy ( including removing the assemlies manually from GAC ) and redeploy the solution ( following the tutorial exactly or adjusting it ) three times. But simply cannot get rid of this problem. Your help is greatly appreciated. I am new to BizTalk. Thanks.

David