UI completely different under local and shinyapps.io when using highcharter

I'm trying to include a packedbubble chart built using the highcharter library in a shiny app. It works like a charm when I deploy the app locally:

but when I deploy the same app to shinyapps.io, it, well, get's completely messed up (for lack of a better description). So the chart's not displayed and the UI fluidPage() set up is effectively ignored:

Sure, I wouldn't need highcharter for this simplified example. But this is just a boiled-down version of a more complex app, where I use clicks on the chart as a further input for the app.

The source code of the self-contained simplified app above reads:


# Define the UI

ui <- fluidPage(
    title = "MockUp",
        # css formating for the headers
        HTML(".title-bar {
              color: #cd003a;
             .welltitle {
             color: #cd003a;
             font-weight: bold;
             font-size: 1.5em;
             text-align: center;
    # title of the entire app
      h1("MockUp Trial: Some grand standing title", class = "title-bar")
    # app layout
      # one row with two columns taking 1/4 and 3/4 of the window width respectively
      column(width = 3,
               # a place holder for a short text explaining how the app works
      column(width = 9, 
             # the interactive packed bubble chart
             highchartOutput("hcontainer", height = "500px")
      column(width = 12,

# Define the server

server <- function(input, output) {
  # Sample data
  data(gapminder, package = "gapminder")
  gapminder <- gapminder %>% 
    filter(year == max(year)) %>% 
    select(country, pop, continent)
  q95 <- as.numeric(quantile(gapminder$pop, .95))
  output$hcontainer <- renderHighchart({

    hchart(gapminder, "packedbubble", 
           hcaes(name = country, value = pop, group = continent)) %>%
      useHTML = TRUE,
      pointFormat = "<b>{point.name}:</b> {point.value}"
    ) %>% 
      packedbubble = list(
        maxSize = "150%",
        zMin = 0,
        layoutAlgorithm = list(
          gravitationalConstant =  0.05,
          splitSeries =  TRUE, # TRUE to group points
          seriesInteraction = TRUE,
          dragBetweenSeries = TRUE,
          parentNodeLimit = TRUE
        dataLabels = list(
          enabled = TRUE,
          format = "{point.name}",
          filter = list(
            property = "y",
            operator = ">",
            value = q95
          style = list(
            color = "black",
            textOutline = "none",
            fontWeight = "normal"
  output$disclaimer <- renderUI({
    HTML("<h4>Disclaimer</h4><br>Data based on the <a href=https://cran.r-project.org/web/packages/gapminder/readme/README.html target='_blank'> gapminder data set</a>. 
    The visualisation is taken directly from the <a href=https://jkunst.com/highcharter/articles/highcharts.html#packedbubble target='_blank'> highcharter website</a>.")      
  # Explanatory text about the app
  output$explainer<- renderUI({
    HTML("Welcome!<br>Just take a look at this awesome visualisation!<br> 
      Isn't it beautiful?")

# Run the app

shinyApp(ui = ui, server = server)

In deployment, I get the following warning message:

Error detecting locale: Error in make.names(col.names, unique = TRUE): invalid multibyte string 10 (using default: en_US)

The app's log file:

2023-05-09T13:28:25.640376+00:00 shinyapps[9065623]: reticulate version: (none)
2023-05-09T13:28:25.640568+00:00 shinyapps[9065623]: Using pandoc: /opt/connect/ext/pandoc/2.16
2023-05-09T13:28:26.001926+00:00 shinyapps[9065623]: Starting R with process ID: '64'
2023-05-09T13:28:26.002260+00:00 shinyapps[9065623]: Shiny application starting ...
2023-05-09T13:28:26.953542+00:00 shinyapps[9065623]: ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
2023-05-09T13:28:26.953587+00:00 shinyapps[9065623]: ✔ dplyr     1.1.2     ✔ readr     2.1.4
2023-05-09T13:28:26.953592+00:00 shinyapps[9065623]: ✔ forcats   1.0.0     ✔ stringr   1.5.0
2023-05-09T13:28:26.953595+00:00 shinyapps[9065623]: ✔ ggplot2   3.4.2     ✔ tibble    3.2.1
2023-05-09T13:28:26.953598+00:00 shinyapps[9065623]: ✔ lubridate 1.9.2     ✔ tidyr     1.3.0
2023-05-09T13:28:26.953602+00:00 shinyapps[9065623]: ✔ purrr     1.0.1     
2023-05-09T13:28:27.061902+00:00 shinyapps[9065623]: ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
2023-05-09T13:28:27.061939+00:00 shinyapps[9065623]: ✖ dplyr::filter() masks stats::filter()
2023-05-09T13:28:27.061955+00:00 shinyapps[9065623]: ✖ dplyr::lag()    masks stats::lag()
2023-05-09T13:28:27.061958+00:00 shinyapps[9065623]: ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors
2023-05-09T13:28:27.294178+00:00 shinyapps[9065623]: Registered S3 method overwritten by 'quantmod':
2023-05-09T13:28:27.294215+00:00 shinyapps[9065623]:   method            from
2023-05-09T13:28:27.294222+00:00 shinyapps[9065623]:   as.zoo.data.frame zoo 
2023-05-09T13:28:27.558792+00:00 shinyapps[9065623]: Highcharts (www.highcharts.com) is a Highsoft software product which is
2023-05-09T13:28:27.558826+00:00 shinyapps[9065623]: not free for commercial and Governmental use
2023-05-09T13:28:27.630887+00:00 shinyapps[9065623]: Listening on
2023-05-09T13:52:23.201739+00:00 shinyapps[9065623]: Running on host: de546b4901ae
2023-05-09T13:52:23.204936+00:00 shinyapps[9065623]: Running as user: uid=10001(shiny) gid=10001(shiny) groups=10001(shiny)
2023-05-09T13:52:23.204959+00:00 shinyapps[9065623]: Connect version: 2023.03.0
2023-05-09T13:52:23.204963+00:00 shinyapps[9065623]: LANG: C.UTF-8
2023-05-09T13:52:23.204967+00:00 shinyapps[9065623]: Working directory: /srv/connect/apps/MoreHCTrials
2023-05-09T13:52:23.205118+00:00 shinyapps[9065623]: Using R 4.3.0
2023-05-09T13:52:23.205135+00:00 shinyapps[9065623]: R.home(): /opt/R/4.3.0/lib/R
2023-05-09T13:52:23.205344+00:00 shinyapps[9065623]: Content will use current R environment
2023-05-09T13:52:23.205353+00:00 shinyapps[9065623]: R_LIBS: (unset)
2023-05-09T13:52:23.205368+00:00 shinyapps[9065623]: .libPaths(): /opt/R/4.3.0/lib/R/library
2023-05-09T13:52:23.232242+00:00 shinyapps[9065623]: shiny version: 1.7.4
2023-05-09T13:52:23.232263+00:00 shinyapps[9065623]: httpuv version: 1.6.10
2023-05-09T13:52:23.232277+00:00 shinyapps[9065623]: rmarkdown version: 2.21
2023-05-09T13:52:23.232281+00:00 shinyapps[9065623]: knitr version: 1.42
2023-05-09T13:52:23.232284+00:00 shinyapps[9065623]: jsonlite version: 1.8.4
2023-05-09T13:52:23.232292+00:00 shinyapps[9065623]: RJSONIO version: (none)
2023-05-09T13:52:23.232295+00:00 shinyapps[9065623]: htmltools version: 0.5.5
2023-05-09T13:52:23.232298+00:00 shinyapps[9065623]: reticulate version: (none)
2023-05-09T13:52:23.232459+00:00 shinyapps[9065623]: Using pandoc: /opt/connect/ext/pandoc/2.16
2023-05-09T13:52:23.553720+00:00 shinyapps[9065623]: Starting R with process ID: '467'
2023-05-09T13:52:23.554146+00:00 shinyapps[9065623]: Shiny application starting ...
2023-05-09T13:52:24.398255+00:00 shinyapps[9065623]: ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
2023-05-09T13:52:24.398283+00:00 shinyapps[9065623]: ✔ dplyr     1.1.2     ✔ readr     2.1.4
2023-05-09T13:52:24.398290+00:00 shinyapps[9065623]: ✔ forcats   1.0.0     ✔ stringr   1.5.0
2023-05-09T13:52:24.398293+00:00 shinyapps[9065623]: ✔ ggplot2   3.4.2     ✔ tibble    3.2.1
2023-05-09T13:52:24.398297+00:00 shinyapps[9065623]: ✔ lubridate 1.9.2     ✔ tidyr     1.3.0
2023-05-09T13:52:24.398308+00:00 shinyapps[9065623]: ✔ purrr     1.0.1     
2023-05-09T13:52:24.500892+00:00 shinyapps[9065623]: ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
2023-05-09T13:52:24.500909+00:00 shinyapps[9065623]: ✖ dplyr::filter() masks stats::filter()
2023-05-09T13:52:24.500914+00:00 shinyapps[9065623]: ✖ dplyr::lag()    masks stats::lag()
2023-05-09T13:52:24.500917+00:00 shinyapps[9065623]: ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors
2023-05-09T13:52:24.744583+00:00 shinyapps[9065623]: Registered S3 method overwritten by 'quantmod':
2023-05-09T13:52:24.744607+00:00 shinyapps[9065623]:   method            from
2023-05-09T13:52:24.744623+00:00 shinyapps[9065623]:   as.zoo.data.frame zoo 
2023-05-09T13:52:25.061024+00:00 shinyapps[9065623]: Listening on
2023-05-09T13:52:25.608310+00:00 shinyapps[9065623]: R: src/unix/core.c:258: uv__finish_close: Assertion `handle->flags & UV_HANDLE_CLOSING' failed.

tells me on the last line that some handle failed R: src/unix/core.c:258: uv__finish_close: Assertion handle->flags & UV_HANDLE_CLOSING' failed.`

I cannot say with any certainty that the problem is linked to highcharter, but deploying the standard Old Faithful app works without a problem. Google unfortunately turns up next to nothing on this. And chatGPT seems likewise lost ...

Has anyone come across a similar issue and - even better - found a solution?
Thanks in advance

1 Like

Having the same issue on a network plotting app.

After a ton of comparing package versions and testing different versions I think I finally found the offending package. The most resent versions of the httpuv package is causing an issue. After running remotes::install_version('httpuv', '1.6.9'), restarting R, and redeploying, your app deploys fine now. Also my app is deploying fine now as well.

Can you confirm this works on your end as well? If so I'll open and issue in the httpuv repo.


I came across the exact same error with src/unix/core.c:258 this morning. Just installed httpuv v1.6.9 and redeployed, and it works. Thank you!

1 Like

Thanks heaps for the effort and the speedy answer. Installing the 1.6.9 version of the httpuv package indeed solved the problem. Both the toy app and my other one now deploy on shinyapps.io just as they do locally!

They just released version v1.6.11 that should fix the issue.


Thanks for the update. My apps deploy perfectly using httpuv version 1.6.11. So, I guess for others with similar issues, it's probably a better solution to upgrade than to downgrade to 1.6.9.

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