Error deploying example demo app to shinyapps.io: "Schema validation failed"

Hello,
deploying the demo app (from here http://shiny.rstudio.com/articles/shinyapps.html) with rsconnect I get the following error.
I never had rsconnect errors like this before, but this is a new computer.

error: Parsing manifest
################################ Begin Task Log ################################
################################# End Task Log #################################
Error: Unhandled Exception: Child Task 597752599 failed: Error parsing manifest: Schema validation failed: Additional properties are not allowed (u'python' was unexpected) at

I have no idea what this is talking about, nor what is the 'manifest' this error refers to.
Would appreciate any pointer.
Thank you for your help

Problem disappeared after a mac reboot...

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