Clone Reports- Application error

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I have a report that runs fine.  I need to add a few fields to it.  when I clone it, and add the new fields, I get an application error, every.single.time. no matter what I try.  Has anyone run into this issue?  I don't want to start from scratch, I simploy want to add a new parameter and a new field to the existing report.  It is so frustrating.