Debugging Exeption error

Hi all ,

When I try to test XML to File I am getting mapping exeption error .I am giving some test XML file as input...

Than I am trying to debug my error going to SXMB_MONI , click on the Red flag...than XML Message - > Inbound Message(Cetral) ->Payloads -> MainDocument and get this screen on the right :

The XML page cannot be displayed 
Cannot view XML input using style sheet. Please correct the error and then click the Refresh button, or try again later. 
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Invalid at the top level of the document. Error processing resource 'file:///C:/Documents and Settings/Administrator/Local ...

Any clues ? I just need to debug my error and I know this is the way to do it ...

Can the test Input.dat file be the problem ??

Thanks!

J