Error on shiny-server

  • Posted on April 18, 2020
  • R
  • lphanAsked by lphan

I’m currently using a shiny server with Ubuntu as the operating system. I’m really new to shiny but attempted created my first survey with the hopes of collecting user inputs and writing them in a csv file.

Locally, it works (i.e. responses get saved in a local folder). However, when I developed a shiny app within my new R Studio server to test it, there is an error which reads:

"Error: cannot open the connection"

This occurs when I press the submit button. I think the error occurs because my shiny server doesn’t have rights to save files in my desired folder, i.e.


The folder I’d save the responses would be located in that shiny folder in my new R Studio directory.

I’ve checked extensively on the website and I found:

Write permission from shiny app

Permission denied while using write.csv on ubuntu server

This is my saveData function:

saveData <- function(data) {

  fileName <- sprintf("%s_%s.csv", humanTime(), digest::digest(data))
  write.csv(x = data, file = file.path(responsesDir, fileName), row.names = FALSE, quote = TRUE)

The response directory (responsesDir) is


I’ve tried the following:

sudo chown shiny:shiny /var/shiny-server/test/

It says that there is no such file or directory.

Am I missing something very obvious? Thank you so much!

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