Flex app calling CF cfc to download file gets "Channel disconnected" fault

I am a newbie with ColdFusion and Flex. I am trying to implement file download/streaming functionality in my Flex 4.5 application and I am running ColdFusion 9 as my back end. More specifically, I have a component in my Flex app that displays a list of files - some of these files can be available for opening (or "previewing") via the client. I want the client to be able to click a button and download the file from the ColdFusion server, after the appropriate security checks are performed (also in ColdFusion). Right now I am just trying to get the basic download functionality to work with a very simple cfc. Here is the cfc code:
<cfcomponent displayname="Preview Document"
     output="false">
     <cffunction name="streamFile" access="remote" returntype="any">
          <cfargument name="filename" displayName="Filename" type="string" required="true" />
          <cfheader name="Content-Disposition" value="attachment;filename=#filename#" >
          <cfcontent type="application/unknown" file="c:\myserverpath\#filename#">
     </cffunction>
</cfcomponent>
When I try this via a cfm, it works fine (I get a File Download window where I can choose to either open or save the file). But when I try to use this in my Flex app, I get an error.
In my Flex app, I have a RemoteObject to access my cfc and a CallResponder:
<s:RemoteObject id="PreviewDocument"
   source="PreviewDocument"
   destination="ColdFusion"
   showBusyCursor="true"/>
<s:CallResponder id="PreviewDocumentResult"
    fault="Alert.show('CallResponder PreviewDocumentResult: ' +
    event.fault.faultString + '\n' + event.fault.faultDetail)"
    result="PreviewDocumentResult_resultHandler(event)"/>
Then I created a button whose click even executes the following line:
PreviewDocumentResult.token = PreviewDocument.streamFile("myfile.pdf");
When I run my app, I get the following fault:
faultCode = "Client.Error.DeliveryInDoubt"
faultString = "Channel disconnected"
faultDetail = "Channel disconnected before an acknowledgement was received"
I have tried many different approaches and searched online for help with this fault, but I could not find any helpful clue to where I can start investigating this.
Can anyone help with why I am getting this fault?
Thanks in advance.

@sir_teddy, thanks for your reply again.
Yes I have created a simple cfc that returns a string successfully (in fact I had used the same cfc and basically just commented out the cfcontent and cfheader tags, and returned the name of the file being requested in the cfreturn tag). When I un-comment the cfcontent tag from the code, the error comes back.
So I am really at a loss here...

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