Without seeing your import file or the steps you took before this point, I think this might be due to the fact that in the step before this, you probably told your importer that the project was defined in the CSV file, but you haven't mapped a a column to the Project field in the field mappings. You will probably either need to:
Short of that, I'd need to see what you entered in the steps before the field mapping, as well as the field mapping itself.
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