PackagesNotFoundError: The following packages are not available from current channels: - sphinx-book-theme[version='>=1.0'] Current channels: - https://conda.anaconda.org/conda-forge/osx-arm64 - https://repo.anaconda.com/pkgs/main/osx-arm64 - https://repo.anaconda.com/pkgs/r/osx-arm64 To search for alternate channels that may provide the conda package you're looking for, navigate to https://anaconda.org and use the search bar at the top of the page. Note: 'use_only_tar_bz2' is enabled. This might be omitting some packages from the index. Set this option to 'false' and retry.