Showcase Mode in CentOS throwing closure error

shiny
#1

Hello,

I have been trying to run an app in showcase mode from Rstudio 1.3.1093 and keep getting the error "cannot coerce type 'closure' to vector of type 'character' [No stack trace available]"

The same error appears when I run runExample("01_hello")

I am trying to run this on a CentOS 7 machine with R 3.6.0 and Shiny 1.4.0.2 (I don't have any control over OS, R, or Shiny version I can use).

Do you have any suggestions about what is going wrong here?

#2

This error is usually due to an attempt to perform an operation on an object with the same name as a function. Common examples are D df data and c.

#3

I'm familiar with the error type, but I don't understand why it's happening in an included example application. If it was just happening in my code I could understand it, but the fact that it occurs in the runExample() function befuddles me.

#4

Hard to say without a reprex. See the FAQ: How to do a minimal reproducible example reprex for beginners.

#5

The reprex is runExample("01_hello").

I get this isn't going to be an issue for all setups, hence the inclusion of OS and version information.

#6

Ideally, a reprex is cut-and-paste for the reader to reproduce the behavior.

library(shiny)
if (interactive()) {
  # List all available examples
  runExample()
  
  # Run one of the examples
  runExample("01_hello")
  
  # Print the directory containing the code for all examples
  system.file("examples", package="shiny")
}

This code is good, but only in an interactive environment. I have it working under Ubuntu 20.10; for CentOS, you'll want to review CRAN notes. I think that's probably where the problem lies.

shiny is ok with R (≥ 3.0.2). Cairo is ok with R (≥ 2.4.0).