NeMo raises LightningNotInstalledException

[SeniorGlassMaster]

actually, pytorch_lightning, hydra, and omegaconf are already installed, and import nemo.collections.asr as nemo_asr is no issues, however, while run vad_model = nemo_asr.models.EncDecClassificationModel(cfg=config.model, trainer=trainer) failed. No similar bug can be found.
it is weird, i can not understand.
has anyone konw how to solve it?

[rohitgr7]

the issue is coming from the NeMo package. Mind raising an issue there?
https://github.com/NVIDIA/NeMo