Debain can not find kas after the installation

hi, 

i read the build instructions" IOT2020-custom_image.pdf" and after i want to build my own image. My Debain can not find kas after the installation. 

parallels@debian-gnu-linux-vm:~/Documents/iot2000-custom-image$ pip3 install kas

Collecting kas

Collecting distro>=1.0.0 (from kas)

Using cached https://files.pythonhosted.org/packages/ea/35/82f79b92fa4d937146c660a6482cee4f3dfa1f97ff3d2a6f3ecba33e712e/distro-1.4.0-py2.py3-none-any.whl

Collecting jsonschema>=2.5.0 (from kas)

Using cached https://files.pythonhosted.org/packages/c5/8f/51e89ce52a085483359217bc72cdbf6e75ee595d5b1d4b5ade40c7e018b8/jsonschema-3.2.0-py2.py3-none-any.whl

Collecting PyYAML>=3.0 (from kas)

Collecting six>=1.11.0 (from jsonschema>=2.5.0->kas)

Using cached https://files.pythonhosted.org/packages/65/eb/1f97cb97bfc2390a276969c6fae16075da282f5058082d4cb10c6c5c1dba/six-1.14.0-py2.py3-none-any.whl

Collecting attrs>=17.4.0 (from jsonschema>=2.5.0->kas)

Using cached https://files.pythonhosted.org/packages/a2/db/4313ab3be961f7a763066401fb77f7748373b6094076ae2bda2806988af6/attrs-19.3.0-py2.py3-none-any.whl

Collecting pyrsistent>=0.14.0 (from jsonschema>=2.5.0->kas)

Collecting importlib-metadata; python_version < "3.8" (from jsonschema>=2.5.0->kas)

Using cached https://files.pythonhosted.org/packages/d7/31/74dcb59a601b95fce3b0334e8fc9db758f78e43075f22aeb3677dfb19f4c/importlib_metadata-1.4.0-py2.py3-none-any.whl

Collecting setuptools (from jsonschema>=2.5.0->kas)

Using cached https://files.pythonhosted.org/packages/a7/c5/6c1acea1b4ea88b86b03280f3fde1efa04fefecd4e7d2af13e602661cde4/setuptools-45.1.0-py3-none-any.whl

Collecting zipp>=0.5 (from importlib-metadata; python_version < "3.8"->jsonschema>=2.5.0->kas)

Using cached https://files.pythonhosted.org/packages/f4/50/cc72c5bcd48f6e98219fc4a88a5227e9e28b81637a99c49feba1d51f4d50/zipp-1.0.0-py2.py3-none-any.whl

Collecting more-itertools (from zipp>=0.5->importlib-metadata; python_version < "3.8"->jsonschema>=2.5.0->kas)

Using cached https://files.pythonhosted.org/packages/bc/e2/3206a70758a21f9878fcf9478282bb68fbc66a5564718f9ed724c3f2bb52/more_itertools-8.1.0-py3-none-any.whl

Installing collected packages: distro, six, attrs, pyrsistent, more-itertools, zipp, importlib-metadata, setuptools, jsonschema, PyYAML, kas

Successfully installed PyYAML-5.3 attrs-19.3.0 distro-1.4.0 importlib-metadata-1.4.0 jsonschema-3.2.0 kas-2.0 more-itertools-8.1.0 pyrsistent-0.15.7 setuptools-45.1.0 six-1.14.0 zipp-1.0.0

parallels@debian-gnu-linux-vm:~/Documents/iot2000-custom-image$ kas build meta-iot2000-apache/kas.yml

bash: kas: command not found

Any ideas why ?

Regards 

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Split from How-to build your own IOT2000 image.