mapshot Error refers to webshot: Error in (function (url = NULL, file = "webshot.png", vwidth = 992, vheight = 744, : webshot.js returned failure value: 1

[KathaRRRina]

Hi there,
as I couldn't find a solution with this issue r-spatial/mapview#419, I got the advice to try it here.
This is my problem:

I am creating a Report with R Markdown and a part of it is based on maps that I create with leaflet. Then I use mapshot to create a jpg and save the map. So that I can load and show the jpg in the Report.

So far this worked fine, but since my last R update (Version 4.2.0) mapshot creates an Error. And unfortunately I can hardly find any support on this error online. Here is my reproducible example:

´´´
library("leaflet")
library("mapview")

m <- leaflet() %>%
addTiles() %>% # Add default OpenStreetMap map tiles
addMarkers(lng=174.768, lat=-36.852, popup="The birthplace of R")
m
mapshot(m, file = "C:/Rplot2.jpg")
´´´

This is the Error I get:

´´´
Could not load c:%5CUsers%5CVedi%5CAppData%5CLocal%5CTemp%5CRtmpqcG5qY%5Cfile36844d44770d.html
Error in (function (url = NULL, file = "webshot.png", vwidth = 992, vheight = 744, :
webshot.js returned failure value: 1
´´´

I have tried:

• reinstallation of the needed packages, also of webshot
• reinstallation of R and R Studio

The problem occurs on a laptop and on a server I use.

Any help is much appreciated!

[Winston Chang]

Does this work?

library(webshot)
webshot("https://www.r-project.org/", "r.png")

I suggest also trying to use webshot for a local HTML file, like this (replacing c:/..../file.html with the path to an actual HTML file on your computer):

webshot("c:/..../file.html", "test.png")

If those work, then the problem is likely to be related to mapshot.

[KathaRRRina]

webshot("c:/..../file.html", "test.png")

Hi wch,
thank you for your answer! Your webshot example works for me. Where can I post issues that relate to mapshot? (I am new here)

[Winston Chang]

I think the original issue that you filed on the mapview repository is probably a good place to continue.

[Carlin Starrs]

I am getting this same error with webshot 0.5.3. Downgrading to 0.5.2 seemed to fix it for some reason. This was all I was trying to run (from the kableExtra package):

mtcars %>%
  kable() %>%
  kable_styling() %>%
  save_kable("test.png")

Both your examples shared above seemed to work with both 0.5.2 and 0.5.3.

Error message:

Could not load c:%5CUsers%5Cusername%5CAppData%5CLocal%5CTemp%5C2%5CRtmp2xUiuR%5Ctest22a032b4e20.html
Error in webshot::webshot(file_temp_html, file, ...) :
webshot.js returned failure value: 1

[c-brendel]

I am getting this same error with webshot 0.5.3. Downgrading to 0.5.2 seemed to fix it for some reason. This was all I was trying to run (from the kableExtra package):

mtcars %>%
  kable() %>%
  kable_styling() %>%
  save_kable("test.png")

Both your examples shared above seemed to work with both 0.5.2 and 0.5.3.

Error message:

Could not load c:%5CUsers%5Cusername%5CAppData%5CLocal%5CTemp%5C2%5CRtmp2xUiuR%5Ctest22a032b4e20.html Error in webshot::webshot(file_temp_html, file, ...) : webshot.js returned failure value: 1

I'm also saving Leaflet maps to HTML files and had the same error, but downgrading to 0.5.2 also solved the problem for me. I'm using Windows with R version 4.0.3

[Winston Chang]

Hm, I think there's a good chance this is due to #110.

[Winston Chang]

I just submitted a new version to CRAN with a fix for this issue.

[c-brendel]

I just checked my code again and now it works with webshot 0.5.4! Thanks!