Unable to deploy a flexdashboard

I’ve built a R flexdasboard using RMarkdown that works perfectly locally:

runtime: shiny
orientation: rows
source_code: embed

But I couldn’t deploy it to shinyapps.io
When I click the Publish button I get an error message:

"Unable to determine file to be published. Click Knit or Preview to render it again, then click the Publish button above the rendered document."

Any ideas of what might be wrong?

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