No module named 'werkzeug.contrib' code example

Example: ModuleNotFoundError: No module named 'werkzeug.contrib'

pip3 uninstall Werkzeug #(will uninstall earlier version, press 'y' to proceed uninstallation, if asked)
pip3 install Werkzeug==0.11.15 #(or check requirements.txt which is under your odoo version and install the version mentioned there.)