[Python] I am trying to run the Google ADK but it shows command 'adk' not found

I was following the complete quickstart quide (https://google.github.io/adk-docs/get-started/quickstart/) but after completing the installation within the python env and without it as well, when I run

adk web


or

adk run multi_agent_tool


I get this error Command 'adk' not found

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