Error

Command /home/docs/checkouts/readthedocs.org/user_builds/isobar/envs/latest/bin/python -m mkdocs build --clean --site-dir _build/html --config-file mkdocs.yml failed: ERROR - Config value: 'theme'. Error: Unrecognised theme name: 'material'. The available installed themes are: readthedocs, mkdocs ERROR - Config value: 'markdown_extensions'. Error: Failed loading extension "pymdownx.tabbed". Aborted with 2 Configuration Errors!