An error has occurred:An error occured while trying to view the document

We are trying to execute a linked report and keep getting this error. The first report with the link renders ok but the linked report does not. We just get an "An error has occurred:An error occured while trying to view the document" error.

We are a .NET environment using BOXI 3.1 and we are using the opendoc function.

How should IIS be configured correctly to use opendoc?

Any help would be appreciated.