@chetangjha My question remain the same “Which Rasa Version you are trying to install and where ? local machine or server” ??
Now as per your screenshots and conversations with Chris Rahme please understand and even I would recommend to read the documentation of rasa:
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If you are trying to install rasa using pip install rasa as I can see in the screenshot. This command will install Rasa 3.0.X version. Big but for installing Rasa 3.0.X you need Python version 3.7 and 3.8 only and in other screenshot I can see python 3.6, even chris pointed out to you. Thanks Chris
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Please I would highly recommend to create conda environment or virtaul env python 3.7 or 3.8 for installling rasa 3.x or If you are planning for 2.X you can create 3.6 or 3.7 or 3.8 respectively.
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When you create the envionment or trying to install rasa with specific version such as pip install rasa==2.8.1 or 2.8.15 etc It will automatically take care every dependencies etc etc ; just sometimes it show some dependences and you just fixed it and all good to go.
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For pip you need a latest pip version I guess 21.2 is the latest (no sure) or it should be alleast 20.0.2.
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For installing rasa latest or olde you can see the following installation videos and select as per your machine: Installation Guides - YouTube
Good Luck!!