'Error while using deploy_app function in Polished package for deploying Rshiny application

While deploying my app using Polished package, I am getting the following error. Not able to rectify. Please help

  app_name = "APP Name",
  api_key = "API Key"
)```

*Creating app bundle...Error in eval(x, envir = envir) : object '.ff.is.available' not found
Error in eval(x, envir = envir) : object '.ff.is.available' not found
Error in eval(x, envir = envir) : object '.ff.is.available' not found
Error in eval(x, envir = envir) : object '.ff.is.available' not found
Error in eval(x, envir = envir) : object '.ff.is.available' not found
Quitting from lines 15-15 (./renv/library/R-4.0/x86_64-apple
darwin17.0/config/doc/../man/fragments/intro.Rmd) 
Error in file(con, "r") : cannot open the connection
In addition: Warning message:
In file(con, "r") :
  cannot open file './renv/library/R-4.0/x86_64-apple-darwin17.0/config/doc/../man/fragments/intro.Rmd': No such file or directory*


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