Unable to pip install nemo-aligner

[SCccc21]

Hi,

I have get nemo_toolkit and Cython packaging installed in my conda environment. But pip install nemo-aligner gives an error

[DinaChen]

same issue here,
problem occurred at:

Collecting pyyaml<6 (from nemo-toolkit[nlp]->nemo-aligner)
Using cached PyYAML-5.4.1.tar.gz (175 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error