Error 'pitch_state.json' expecting ID when finetuning for spanish multispeaker model
**Describe the bug**

I'm trying to fine tune the tts_es_fastpitch_multispeaker.nemo model and have this issue with the pitch_state.json file. I just copy the format in "scripts/tts_dataset_files/openslr_es/pitch_stats.json" and I have this error.

`mismatched input 'pitch_state.json' expecting ID`

**Steps/Code to reproduce bug**

I only add my new speaker with a new number to the pitch_stats.json with his respective mean and std pitch. I use the config file in "NeMo/examples/tts/conf/es/fastpitch_align_44100_ipa_multi.yaml" and try modifing the sup_data_type to match the number of my new speaker but it doesn't work either.

`sup_data_types: ["align_prior_matrix", "pitch", 174]`

The code use for fine tuning:

`
!(python fastpitch_finetune.py --config-name=fastpitch_align_44100_ipa_multi.yaml \
  train_dataset=./transcript_train_spk.json \
  validation_datasets=./transcript_dev_spk.json \
  sup_data_path=./fastpitch_sup_data \
  pitch_stats_path= tts_dataset_diles/pitch_state.json \
  phoneme_dict_path=tts_dataset_files/es_ES_nv230301.dict \
  exp_manager.exp_dir=./ljspeech_to_9017_no_mixing_5_mins \
  +init_from_nemo_model=./tts_es_fastpitch_multispeaker.nemo \
  trainer.check_val_every_n_epoch=25 \
  model.train_ds.dataloader_params.batch_size=12 model.validation_ds.dataloader_params.batch_size=12 \
  model.n_speakers=175 model.pitch_mean=137.2 model.pitch_std=44.2 \
  model.pitch_fmin=30 model.pitch_fmax=512 model.optim.lr=2e-4 \
  ~model.optim.sched model.optim.name=adam trainer.devices=1 trainer.strategy=null \
  +model.text_tokenizer.add_blank_at=true \
)
`

**Environment details**

Use Google Collab following this [example](https://github.com/NVIDIA/NeMo/blob/main/tutorials/tts/FastPitch_Finetuning.ipynb)



