asp.net mvc - wcf excel: An error occurred while processing your request -

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i develop application using asp.net mvc c# , wcf. tried import excel file , save in database. worked on local system. then, later deploy iis. initially, worked, later displays error

error. error occurred while processing request

also, other menu displays this. works on local system questions

  1. how resolve issue
  2. how debug on iis


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