Oracle Message IMP-00075 - Warning: The nested table may contain partial rows or duplicate rows

ERRORWarning: The nested table may contain partial rows or duplicate rows
CAUSEAn error occurred inserting data into an outer or inner nested table. If the error occurred in the outer table, rows are still inserted into the inner tables. If the error occurred in an inner table, data is still inserted into the outer table and other inner tables. This can result in duplicate inner table rows or partial logical rows.
ACTIONExamine the data in the tables. Delete the incorrect rows or drop the entire table and perform the import again.