Error Deploying Shiny Apps

Please what does this error mean and how can I solve it? I am trying to deploy a shiny app.

Error in $<-.data.frame(*tmp*, "config_url", value = "https://www.shinyapps.io/admin/#/application/") :
replacement has 1 row, data has 0

Does you app run ok locally ?
are you registered with an account in shinyapps.io ?
have you done all the appropriate token setting etc ?

I App runs locally but it throws a warning error:

Warning: Error in h: error in evaluating the argument 'x' in selecting a method for function 'sort': argument is of length zero
  101: <Anonymous>
Warning in tm_map.SimpleCorpus(docs, content_transformer(tolower)) :
  transformation drops documents.

I don't know if this warning is the cause of why the app disconnects from the Shiny server so quickly.

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