AttributeError: 'Namespace' object has no attribute 'func'

# Environment:
For running beakerx i start new venv:
```
python3.12 -m venv env
```

```
$ uname -a
Darwin mypc 23.4.0 Darwin Kernel Version 23.4.0: Fri Mar 15 00:10:42 PDT 2024; root:xnu-10063.101.17~1/RELEASE_ARM64_T6000 arm64

$ python --version
Python 3.12.3
```

# Installed packages:
```
$ pip freeze
anyio==4.3.0
appnope==0.1.4
argon2-cffi==23.1.0
argon2-cffi-bindings==21.2.0
arrow==1.3.0
asttokens==2.4.1
attrs==23.2.0
beakerx==2.4.3
beakerx_base==2.3.0
beautifulsoup4==4.12.3
bleach==6.1.0
bottle==0.12.25
certifi==2024.2.2
cffi==1.16.0
charset-normalizer==3.3.2
comm==0.2.2
debugpy==1.8.1
decorator==5.1.1
defusedxml==0.7.1
executing==2.0.1
fastjsonschema==2.19.1
fqdn==1.5.1
idna==3.7
ipykernel==6.29.4
ipython==8.24.0
ipywidgets==8.1.2
isoduration==20.11.0
jedi==0.19.1
Jinja2==3.1.4
jsonpointer==2.4
jsonschema==4.22.0
jsonschema-specifications==2023.12.1
jupyter-events==0.10.0
jupyter_client==8.6.2
jupyter_core==5.7.2
jupyter_server==2.14.0
jupyter_server_terminals==0.5.3
jupyterlab_pygments==0.3.0
jupyterlab_widgets==3.0.10
MarkupSafe==2.1.5
matplotlib-inline==0.1.7
mistune==3.0.2
nbclient==0.10.0
nbconvert==7.16.4
nbformat==5.10.4
nest-asyncio==1.6.0
numpy==1.26.4
overrides==7.7.0
packaging==24.0
pandas==2.2.2
pandocfilters==1.5.1
parso==0.8.4
pexpect==4.9.0
platformdirs==4.2.2
prometheus_client==0.20.0
prompt-toolkit==3.0.43
psutil==5.9.8
ptyprocess==0.7.0
pure-eval==0.2.2
py4j==0.10.9.7
pycparser==2.22
Pygments==2.18.0
pyspark==3.5.1
python-dateutil==2.9.0.post0
python-json-logger==2.0.7
pytz==2024.1
PyYAML==6.0.1
pyzmq==26.0.3
referencing==0.35.1
requests==2.32.2
rfc3339-validator==0.1.4
rfc3986-validator==0.1.1
rpds-py==0.18.1
Send2Trash==1.8.3
setuptools==70.0.0
six==1.16.0
sniffio==1.3.1
soupsieve==2.5
stack-data==0.6.3
terminado==0.18.1
tinycss2==1.3.0
tornado==6.4
traitlets==5.14.3
types-python-dateutil==2.9.0.20240316
tzdata==2024.1
uri-template==1.3.0
urllib3==2.2.1
wcwidth==0.2.13
webcolors==1.13
webencodings==0.5.1
websocket-client==1.8.0
widgetsnbextension==4.0.10
```

# What i do:
Install beakerx via pip:
```
$ pip install beakerx
```
Also, install setuptools and ipykernel:
```
$ pip install setuptools
$ pip install ipykernel
```

After this, i run commands bellow:
```
$ beakerx install
$ beakerx
```

# What i got
Error:
```
$ beakerx
Traceback (most recent call last):
File "/Users/user/Documents/jupyter/env/bin/beakerx", line 8, in
sys.exit(run())
^^^^^
File "/Users/user/Documents/jupyter/env/lib/python3.12/site-packages/beakerx/__init__.py", line 70, in run
parse_widgets()
File "/Users/user/Documents/jupyter/env/lib/python3.12/site-packages/beakerx/commands.py", line 81, in parse_widgets
args.func(args)
^^^^^^^^^
AttributeError: 'Namespace' object has no attribute 'func'
```

I also tried to install and run on python 3.9. But got the same result