rstudio
Error in `compile_data()` when using `bs_theme()`
I confirm I have updated to the latest version of bslib via remotes::install_github("rstudio/bslib").
Describe the problem
I am hitting a persistent error with bs_theme() that I am struggling to resolve:
Error in `compile_data()`:
! Error: argument `$color` of `rgba($color, $alpha)` must be a color
on line 100:20 of ../../../../../../Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/bslib/builtin/bs5/shiny/_variables.scss, in function `rgba`
from line 100:20 of ../../../../../../Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/bslib/builtin/bs5/shiny/_variables.scss
from line 218:9 of stdin
>> $table-striped-bg: rgba($primary, 0.06) !default;
Reproducible example (note, I hit this issue locally, but not on posit Cloud so it may be OS-related?):
# Load library
library(bslib)
#>
#> Attaching package: 'bslib'
#> The following object is masked from 'package:utils':
#>
#> page
# Update theme (from example in help notes)
theme <- bs_theme(
# Controls the default grayscale palette
bg = "#202123", fg = "#B8BCC2",
# Controls the accent (e.g., hyperlink, button, etc) colors
primary = "#EA80FC", secondary = "#48DAC6",
base_font = c("Grandstander", "sans-serif"),
code_font = c("Courier", "monospace"),
heading_font = "'Helvetica Neue', Helvetica, sans-serif",
# Can also add lower-level customization
"input-border-color" = "#EA80FC"
)
Created on 2025-10-15 with reprex v2.1.1
Session Info
> devtools::session_info()
─ Session info ─────────────────────────────────────────────────────────────────────────────────────────────────
setting value
version R version 4.5.1 (2025-06-13)
os macOS Sequoia 15.6.1
system aarch64, darwin20
ui RStudio
language (EN)
collate en_US.UTF-8
ctype en_US.UTF-8
tz Europe/London
date 2025-10-15
rstudio 2025.09.1+401 Cucumberleaf Sunflower (desktop)
pandoc 3.6.3 @ /Applications/RStudio.app/Contents/Resources/app/quarto/bin/tools/aarch64/ (via rmarkdown)
quarto 1.6.40 @ /usr/local/bin/quarto
─ Packages ─────────────────────────────────────────────────────────────────────────────────────────────────────
package * version date (UTC) lib source
bslib * 0.9.0.9000 2025-10-15 [1] Github (rstudio/bslib@ba1be9a)
cachem 1.1.0 2024-05-16 [1] CRAN (R 4.5.0)
callr 3.7.6 2024-03-25 [1] CRAN (R 4.5.0)
cli 3.6.5 2025-04-23 [1] CRAN (R 4.5.0)
clipr 0.8.0 2022-02-22 [1] CRAN (R 4.5.0)
devtools 2.4.6 2025-10-03 [1] CRAN (R 4.5.0)
digest 0.6.37 2024-08-19 [1] CRAN (R 4.5.0)
ellipsis 0.3.2 2021-04-29 [1] CRAN (R 4.5.0)
evaluate 1.0.5 2025-08-27 [1] CRAN (R 4.5.0)
fastmap 1.2.0 2024-05-15 [1] CRAN (R 4.5.0)
fs 1.6.6 2025-04-12 [1] CRAN (R 4.5.0)
glue 1.8.0 2024-09-30 [1] CRAN (R 4.5.0)
htmltools 0.5.8.1 2024-04-04 [1] CRAN (R 4.5.0)
jquerylib 0.1.4 2021-04-26 [1] CRAN (R 4.5.0)
jsonlite 2.0.0 2025-03-27 [1] CRAN (R 4.5.0)
knitr 1.50 2025-03-16 [1] CRAN (R 4.5.0)
lifecycle 1.0.4 2023-11-07 [1] CRAN (R 4.5.0)
magrittr 2.0.4 2025-09-12 [1] CRAN (R 4.5.0)
memoise 2.0.1 2021-11-26 [1] CRAN (R 4.5.0)
pillar 1.11.1 2025-09-17 [1] CRAN (R 4.5.0)
pkgbuild 1.4.8 2025-05-26 [1] CRAN (R 4.5.0)
pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 4.5.0)
pkgload 1.4.1 2025-09-23 [1] CRAN (R 4.5.0)
processx 3.8.6 2025-02-21 [1] CRAN (R 4.5.0)
ps 1.9.1 2025-04-12 [1] CRAN (R 4.5.0)
purrr 1.1.0 2025-07-10 [1] CRAN (R 4.5.0)
R6 2.6.1 2025-02-15 [1] CRAN (R 4.5.0)
remotes 2.5.0 2024-03-17 [1] CRAN (R 4.5.0)
reprex * 2.1.1 2024-07-06 [1] CRAN (R 4.5.0)
rlang 1.1.6 2025-04-11 [1] CRAN (R 4.5.0)
rmarkdown 2.30 2025-09-28 [1] CRAN (R 4.5.0)
rstudioapi 0.17.1 2024-10-22 [1] CRAN (R 4.5.0)
sass 0.4.10 2025-04-11 [1] CRAN (R 4.5.0)
sessioninfo 1.2.3 2025-02-05 [1] CRAN (R 4.5.0)
tibble 3.3.0 2025-06-08 [1] CRAN (R 4.5.0)
usethis 3.2.1 2025-09-06 [1] CRAN (R 4.5.0)
vctrs 0.6.5 2023-12-01 [1] CRAN (R 4.5.0)
withr 3.0.2 2024-10-28 [1] CRAN (R 4.5.0)
xfun 0.53 2025-08-19 [1] CRAN (R 4.5.0)
yaml 2.3.10 2024-07-26 [1] CRAN (R 4.5.0)
[1] /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library
- ── Packages attached to the search path.
Hi @LewisAJones, I'm not able to reproduce the error from the code you've provided. Seems there is some additional code/context that is missing given that the error derives from Shiny's Sass code.
Would you mind trying to include a minimal Shiny app to reproduce the error? This runs OK for me:
library(shiny)
theme <- bs_theme(
bg = "#202123", fg = "#B8BCC2",
primary = "#EA80FC", secondary = "#48DAC6",
base_font = c("Grandstander", "sans-serif"),
code_font = c("Courier", "monospace"),
heading_font = "'Helvetica Neue', Helvetica, sans-serif",
"input-border-color" = "#EA80FC"
)
ui <- fluidPage(
theme = theme,
"Reprex"
)
shinyApp(ui, function(input, output) {})
Hi @cpsievert, thanks for taking a look! As I noted above, this seems to be potentially OS-related. I am not getting an error on Posit Cloud, but on my local machine for the same code and setup.
The code you've provided results in the same error as above for me:
> library(shiny)
+
+ theme <- bs_theme(
+ bg = "#202123", fg = "#B8BCC2",
+ primary = "#EA80FC", secondary = "#48DAC6",
+ base_font = c("Grandstander", "sans-serif"),
+ code_font = c("Courier", "monospace"),
+ heading_font = "'Helvetica Neue', Helvetica, sans-serif",
+ "input-border-color" = "#EA80FC"
+ )
+ ui <- fluidPage(
+ theme = theme,
+ "Reprex"
+ )
+
+ shinyApp(ui, function(input, output) {})
Error in `compile_data()`:
! Error: argument `$color` of `rgba($color, $alpha)` must be a color
on line 100:20 of ../../../../../../Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/bslib/builtin/bs5/shiny/_variables.scss, in function `rgba`
from line 100:20 of ../../../../../../Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/bslib/builtin/bs5/shiny/_variables.scss
from line 218:9 of stdin
>> $table-striped-bg: rgba($primary, 0.06) !default;
Of course, thanks!
> sessionInfo()
R version 4.5.1 (2025-06-13)
Platform: aarch64-apple-darwin20
Running under: macOS Sequoia 15.6.1
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/lib/libRlapack.dylib; LAPACK version 3.12.1
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
time zone: Europe/London
tzcode source: internal
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] bslib_0.9.0 shiny_1.11.1
loaded via a namespace (and not attached):
[1] digest_0.6.37 later_1.4.4 R6_2.6.1 httpuv_1.6.16 fastmap_1.2.0 magrittr_2.0.4 cachem_1.1.0 htmltools_0.5.8.1
[9] lifecycle_1.0.4 promises_1.3.3 cli_3.6.5 sessioninfo_1.2.3 xtable_1.8-4 sass_0.4.10 jquerylib_0.1.4 compiler_4.5.1
[17] tools_4.5.1 mime_0.13 yaml_2.3.10 Rcpp_1.1.0 jsonlite_2.0.0 rlang_1.1.6
Huh, strange. Just to make sure, if you run that code snippet from a new/clean R session, does it still error?
Yes, I've tried new/clean R sessions, updating R, reinstalling shiny/bslib :')
I'm completely bewildered by it!