error when using four fields in contents ,following pyserini/docs /usage-index.md about pyserini

[ywm5]

!python -m pyserini.encode input --corpus tests/resources/simple_cacm_corpus.json --fields text --delimiter "\n" --shard-id 0 --shard-num 1 output --embeddings path/to/output/dir encoder --encoder castorini/tct_colbert-v2-hnp-msmarco --fields text --batch 32 --fp16
simple_cacm_corpus.json is as follows:
{ "id": "doc1", "contents": "www.url.com\ntitle\nthis is the contents.\ndocument expansion"}

[ywm5]

oh I forget the fields !python -m pyserini.encode input --corpus tests/resources/simple_cacm_corpus.json --fields url title text expand --delimiter "\n" --shard-id 0 --shard-num 1 output --embeddings path/to/output/dir --to-faiss encoder --encoder castorini/tct_colbert-v2-hnp-msmarco --fields text --batch 32 --fp16