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I found the problem.

In the setup.py file, I had a missing , for the last node in the entry pointsi.e.

entry_points={
    'console_scripts': [
        'listener = demo_nodes_py.topics.listener:main',
        'talker = demo_nodes_py.topics.talker:main'
        'listener_qos = demo_nodes_py.topics.listener_qos:main'

    ],
},
NOTE :  The missing `,` before the `listener_qos` node.

The strange thing here is, compiler compiles all the 3 nodes and I can see in the <ws/build/package-name/build/lib/> folder. Shouldnt the compiler just ignore the 3rd node listener_qos in this case ?