Error messages during CSV import mention which "row" the error is in, but print the column number:
/dspace/bin/dspace metadata-import -e firstname.lastname@example.org -f import.csv
Bad metadata declaration in row 147:
The problem was that I accidentally deleted the the metadata field name in the first row, column 127. The message made it unnecessarily confusing by referring to "row 147" instead of column 147.