Error when running to Transcribe Audio

[yueyin85]

ImportError Traceback (most recent call last)
in ()
22
23 note_seq.play_sequence(est_ns, synth=note_seq.fluidsynth,
---> 24 sample_rate=SAMPLE_RATE, sf2_path=SF2_PATH)
25 note_seq.plot_sequence(est_ns)

4 frames
/usr/local/lib/python3.7/dist-packages/pretty_midi/instrument.py in fluidsynth(self, fs, sf2_path)
454
455 if not _HAS_FLUIDSYNTH:
--> 456 raise ImportError("fluidsynth() was called but pyfluidsynth "
457 "is not installed.")
458

ImportError: fluidsynth() was called but pyfluidsynth is not installed.

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