Hi @sravan2366, thanks for providing the full log.txt.
There seems to be something wrong with the tensorflow package that is stored in your cache, where already downloaded packages are stored. I found the possible solution on StackOverflow: https://stackoverflow.com/a/40184923/5480536
A possible solution is to use the --no-cache-dir option on the pip install command, which will result in pip downloading fresh copies of every package.
Can you try this command, and see if that fixes the issue?
$ pip install --no-cache-dir rasa-x --extra-index-url https://pypi.rasa.com/simple