Shiny App does not load

Dear All,

I am relatively new to shiny, so sorry if this is a "stupid" question.

I am currently trying to create my first shiny app, but if I create a shiny web app and simply click the "Run App" button R does not load the app.

This is the default shiny app I am trying to execute:


# Define UI for application that draws a histogram
ui <- fluidPage(

    # Application title
    titlePanel("Old Faithful Geyser Data"),

    # Sidebar with a slider input for number of bins 
                        "Number of bins:",
                        min = 1,
                        max = 50,
                        value = 30)

        # Show a plot of the generated distribution

# Define server logic required to draw a histogram
server <- function(input, output) {

    output$distPlot <- renderPlot({
        # generate bins based on input$bins from ui.R
        x    <- faithful[, 2]
        bins <- seq(min(x), max(x), length.out = input$bins + 1)

        # draw the histogram with the specified number of bins
        hist(x, breaks = bins, col = 'darkgray', border = 'white')

# Run the application 
shinyApp(ui = ui, server = server)

In addition here is the sessionInfo():
R version 4.1.0 (2021-05-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19042)

Matrix products: default

[1] LC_COLLATE=German_Austria.1252 LC_CTYPE=German_Austria.1252 LC_MONETARY=German_Austria.1252
[4] LC_NUMERIC=C LC_TIME=German_Austria.1252

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] shiny_1.6.0

loaded via a namespace (and not attached):
[1] compiler_4.1.0 fastmap_1.1.0 ellipsis_0.3.2 magrittr_2.0.1 R6_2.5.0 promises_1.2.0.1
[7] later_1.2.0 htmltools_0.5.1.1 tools_4.1.0 Rcpp_1.0.6 digest_0.6.27 xtable_1.8-4
[13] httpuv_1.6.1 lifecycle_1.0.0 mime_0.11 rlang_0.4.11

thanks for any advice or solution.

Your code seems to work for me when I save it as app.R. Does anything happen when you click the "Run App" button?

I'm definitely outside my comfort/knowledge zone here, but it seems others (maybe) have reported similar issues with 4.1 and so I wonder if you might try to test this in 4.05 and see if the issue persists?

Thanks for your answer.

When I click the run app button the console shows:

Loading required package: shiny

and the red stop sign is visible, but there is nothing happening.

I tried it with 4.0.5 but I have the same problem there.

I’m curious, do you have a pop up blocker enabled? By default, for me anyway, running the app pulls up a separate window. Have you tried switching the behavior to “Run External” on app run?

Thank you for your answer.

I disabled the pop-up blocker in chrome but that did not change anything. I also tried "Run External".
I tried to run a markdown script and if I do that there is a separate window that pops up and shows me the document. So I guess RStudio is able to create that additional window.