Cannot access a closed stream – biztalk 2004 to 2006 migration with submit direct adapter

hi all,

we are currently, migrating a biztalk server 2004 to 2006. we are using the submitdirect adapter, and we are currently encountering problems in one of our services. we are getting a "Cannot access a closed stream" error message after the orchestration has finished processing. This is the code we use to send and receive the message:

 // Create BizTalk message submission object
01 BizTalkMessaging btm = new BizTalkMessaging();
02      StreamReader sr = null;

 // Submit message and wait for response
 // The charset information is empty because it will be determined by XML disassembler from BOM of file
03 IBaseMessage responseMsg = btm.SubmitSyncMessage(btm.CreateMessageFromStream(submitURI, null, fileStream));

 // Get an XML from response and print it out in console window
04 if (null != responseMsg)
05 {
06  if ((responseMsg.BodyPart!=null) && (responseMsg.BodyPart.Data!=null))
07  {
08   StreamReader sr = new StreamReader(responseMsg.BodyPart.Data);
09   Console.WriteLine("Response message:");
10   Console.WriteLine(sr.ReadToEnd());
11  }
12 }

on line 10, we get the "Cannot access a closed stream error" but this does not happen on a regular basis.

we also get this error in the eventlog:

Event Type: Error
Event Source: .NET Runtime
Event Category: None
Event ID: 0
Date:  11/28/2006
Time:  6:13:16 PM
User:  N/A
Computer: MND06070656
Description:
The description for Event ID ( 0 ) in Source ( .NET Runtime ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: Unable to open shim database version registry key – v2.0.50727.00000.

would it be possbile, that this error is related to the error on the first example?

your help, would truly be appreciated.