Theme error: An error happened in rendering the page index. Reason: UndefinedError("'style' is undefined")

[devinschumacher]

sphinx-build -b html -d ../gh-page/basic/doctrees   source ../gh-page/basic/html
Running Sphinx v7.2.6
building [mo]: targets for 0 po files that are out of date
writing output...
building [html]: targets for 6 source files that are out of date
updating environment: [new config] 6 added, 0 changed, 0 removed
reading sources... [100%] very/index
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
copying assets... copying static files... done
copying extra files... done
done
writing output... [ 17%] index
Theme error:
An error happened in rendering the page index.
Reason: UndefinedError("'style' is undefined")
make: *** [html] Error 2