How to resolve 'Could not file found' error in Webperformance testing using vsts 2010

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testing

Hi to all,

I am trying to do webperformance test to a website which is deployed on third party system using vsts 2010 ultimate.

In this test I am trying to record actions of Uploading a file.But my test is failed.

It shows "Request failed:Could not find file 'C:\Users\System1\documents\visual studio 2010\Projects\TestProject1\TestResults\system1_SYSTEM1-PC 2010-10-21 14_03_18\Out\MS_61-1996.pdf'.

But normally it is uploading well.(i.e not in webperformance test).
So can you please help me in finding solution. And tell me is there any test settings that we have to change for doing a load test to a website which is deployed on third party system.
It's urgent.

I am using vsts 2010 ultimate,windows-7 operating system.

Thanks in advance.