Error in parseValues: argument "values" is missing, no default

I am running into a weird error all of a sudden with a Shiny application. Whenever I run it, it launches and then immediately shuts down with the message:

Warning: Error in parseValues: argument "values" is missing, with no default
3: runApp
2: print.shiny.appobj
1: <Anonymous>

I get this whether I hit Run App or execute it with Ctrl+Enter. I have two other Shiny applications with almost identical construction that are not having this issue, and I can't figure out how to debug it. Does anyone have an idea where the "parseValues" piece is coming from? I'm using R 4.2.3 in RStudio 2023.03.2 with shiny1.7.4.

Thanks.

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