Montreal-Forced-Aligner: [ERROR] Getting MultiprocessingError, KaldiProcessingError when attempting to align a 2-speaker audio file

I tried to run the sample Colab notebook (https://gist.github.com/NTT123/12264d15afad861cb897f7a20a01762e) locally (as a .py file). It’s working fine when I use it for the provided ljspeech data. However, when I try it with my own data (a 16khz wav file and its .txt transcript), I get the following error:

(The audio file is around 4 minutes long, if that’s relevant.)

$ mfa align -t ./temp -j 2 ./temp_mfa modified_librispeech-lexicon.txt ./english.zip ./ljs_alignedcapstone
 WARNING  The previous run had a different configuration than the current, which may cause issues. Please see the log for details or use --clean flag if issues 
          are encountered.
 WARNING  The previous run had a different configuration than the current, which may cause issues. Please see the log for details or use --clean flag if issues 
          are encountered.
 INFO     Setting up corpus information...
 INFO     Found 1 speaker across 1 file, average number of utterances per speaker: 1.0
 INFO     Initializing multiprocessing jobs...
 WARNING  Number of jobs was specified as 2, but due to only having 1 speakers, MFA will only use 1 jobs. Use the --single_speaker flag if you would like to    
          split utterances across jobs regardless of their speaker.
 INFO     Text already normalized.
 INFO     Creating corpus split with features...
 100% ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1/1  [ 0:00:04 < 0:00:00 , ? it/s ] INFO     Features already generated.
 INFO     Compiling training graphs...
 100% ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1/1  [ 0:00:04 < 0:00:00 , ? it/s ] INFO     Performing first-pass alignment...
 INFO     Generating alignments...
   0% ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0/1  [ 0:00:14 < -:--:-- , ? it/s ] ERROR    There was an error in the run, please see the log.
Exception ignored in atexit callback: <bound method ExitHooks.history_save_handler of <montreal_forced_aligner.command_line.mfa.ExitHooks object at 0x0000016DD15D2410>>
Traceback (most recent call last):
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\command_line\mfa.py", line 97, in history_save_handler
    raise self.exception
  File "C:\Users\Ketaki\anaconda3\envs\aligner\Scripts\mfa-script.py", line 10, in <module>
    sys.exit(mfa_cli())
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\click\core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\rich_click\rich_group.py", line 21, in main
    rv = super().main(*args, standalone_mode=False, **kwargs)
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\click\core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\click\core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\click\core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\click\decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\command_line\align.py", line 113, in align_corpus_cli
    aligner.align()
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\alignment\pretrained.py", line 412, in align
    super().align()
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\alignment\base.py", line 345, in align
    self.align_utterances()
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\alignment\mixins.py", line 436, in align_utterances
    for utterance, log_likelihood in run_kaldi_function(
  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\utils.py", line 753, in run_kaldi_function
    raise v
montreal_forced_aligner.exceptions.MultiprocessingError: MultiprocessingError:

Job 1 encountered an error:
Traceback (most recent call last):

  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\abc.py", line 85, in run
    yield from self._run()

  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\alignment\multiprocessing.py", line 955, in _run
    self.check_call(align_proc)

  File "C:\Users\Ketaki\anaconda3\envs\aligner\lib\site-packages\montreal_forced_aligner\abc.py", line 112, in check_call
    raise KaldiProcessingError([self.log_path])

montreal_forced_aligner.exceptions.KaldiProcessingError: KaldiProcessingError:

There were 1 job(s) with errors when running Kaldi binaries.
See the log files below for more information.
temp\temp_mfa\alignment\log\align.1.log`