installation error on windows

I follow to our instruction.
```
conda create -y -n beakerx 'python>=3' nodejs pandas 'openjdk=8.0.121' maven py4j requests
source activate beakerx
conda config --env --add pinned_packages 'openjdk=8.0.121'
conda install -y -c conda-forge ipywidgets
(cd beakerx; pip install -e . --verbose)
beakerx install
```

while I run
`conda install -y -c conda-forge ipywidgets`
I get this error:
```
Solving environment: failed
CondaValueError: Malformed version string '8.0.121'': invalid character(s).
```

To fix error I removed apostrophes for 'openjdk=8.0.121' and after that build was successful