USB RAW Control Communication in LabVIEW

Iam trying to open the zipped file by NI "USB RAW Control Communication in LabVIEW".The VI is attached below.It recognized my raw device in VISA Resource Name.Iam using a pendrive.But while running it shows an error 'VISA: (Hex 0xBFFF0072) The resource is valid, but VISA cannot currently access it.'I learned this problem from some discussion forums in labview,but can't find a solution.Plz help.Post your valuable suggestions........Also in that example how we will give the request,request type,value,index etc:-.What does it indicates?
Thanks as kudos only
Attachments:
USBRawControl.vi ‏152 KB

STOP creating multiple posts for your question!
http://forums.ni.com/t5/LabVIEW/Requirements-to-read-from-a-USB-port/td-p/1959445

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USB RAW Control Communication in LabVIEW