Unable to configure nRF Sniffer for 802.15.4 for ZigBee

Hello All,

I wanted to sniff ZigBee Packets using Wireshark SW, I am following the below link for the setup,

https://docs.nordicsemi.com/bundle/ug_sniffer_802154/page/UG/sniffer_802154/installing_sniffer_802154.html

However i am getting syntax error when i try to run the command "nrf802154_sniffer.bat --extcap-interfaces" as recommended to install the nRF pulgin,

i follow the steps on below link 

https://docs.nordicsemi.com/bundle/ug_sniffer_802154/page/UG/sniffer_802154/installing_sniffer_802154_plugin.html

Now i have cloned the git Hub repository and did not change any file after cloning, So i am not sure why i am getting this error, 

I had made this setup last year and i have this working in one of my system But for Bigger network test i need to make this setup in further two more system and on both system i get the same error

I verfied the python and pip version and both of them look fine.

Please help me here so that i know ehat i am doing wrong

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