Hi @cangchen8180, welcome to the forum.
Michel is right. Your dataset seems to have some formatting mistakes; it’s missing some predicates in some fields. Compare your dataset to the dataset here. For example your last set of fields should be:
_:st1 <name> "Star Trek: The Motion Picture" .
_:st1 <release_date> "1979-12-07" .
_:st1 <revenue> "139000000" .
_:st1 <running_time> "132" .
_:st1 <dgraph.type> "Film" .
You’re missing the <name> and <revenue> predicates.
You have similar missing pieces in previous sets. Fix those and you won’t have trouble running the mutation and then perform queries.
Hope this helps.