Traceback (most recent call last):
File "postgresql/importcsv.py", line 42, in <module>
load_csv(os.path.abspath(filename), db)
File "postgresql/importcsv.py", line 33, in load_csv
cursor.copy_expert(q, fp)
psycopg2.errors.NotNullViolation: null value in column "artist_id" violates not-null constraint
DETAIL: Failing row contains (220, 278, 56, 10, null, Demopoulos, t, null, 2, null, Written By, null).
CONTEXT: COPY release_track_artist, line 221: "56,10,278,,Demopoulos,1,,2,,Written By,"