error: devstack/lib/tempest: line 637: tox:command not found. 

The above error is obtained when something went wrong while running the script ./stack.sh.

Mainly when you run the script 2-3 due to some other reasons.

So how to fix the following error: devstack/lib/tempest: line 637: tox:command not found. I recently got a fix for it.

Firstly check for the tox & tox related folders at location /usr/local/lib/python 3.6/site-packages.

Once you get tox & its related folders delete them and run the ./stack.sh script again.

The script will automatically download and Install the proper version of tox which will fix the tox: command not found error.