Flexdashboard and Bootswatch throwing error

I get the following error

Error in match.arg(theme, themes()) : 'arg' must be NULL or a character vector

when using the code specified on Theming flexdashboard • flexdashboard

output:
flexdashboard::flex_dashboard:
theme:
version: 4
bootswatch: lux

It appears to be having an issue with nothing coming directly after theme: in yaml, but I have tried a few iterations and the code doesn't run at all. Seeing as this is the version specified on the flexdashboard/theme site I don't know what's happening for me?

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