How do I find a "missing" file?

When I select "Save a Copy of Title" from the file menu, it does save of copy of the title in the location I have selected. However, instead of closing the original file and opening the new one, I get an error message: "Error - cannot find file". The new copy works fine and the original title publishes fine -- no errors or files missing on error check. How do I find out what file is missing? I want to prevent this error from happening.

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