I'm running Windows 11 and have Positron installed. When I start Positron I see this error:
The terminal process "c:\Program Files\Positron\resources\app\extensions\positron-supervisor\resources\supervisor-wrapper.bat 'C:\Users\MANDEL~1\AppData\Local\Temp\kallichore-d4ca8625-27280.out.log', 'c:\Program Files\Positron\resources\app\extensions\positron-supervisor\resources\kallichore\kcserver.exe', '--log-level', 'debug', '--log-file', 'C:\Users\MANDEL~1\AppData\Local\Temp\kallichore-d4ca8625-27280.log', '--connection-file', 'C:\Users\MANDEL~1\AppData\Local\Temp\kallichore-d4ca8625-27280.json', '--resource-sample-interval', '1000', '--transport', 'named-pipe', '--idle-shutdown-hours', '1'" terminated with exit code: 1.
followed by this in the console:
R 4.5.3 failed to start.
The supervisor process exited unexpectedly during startup
Error: The supervisor process exited unexpectedly during startup
at t.KCApi.start (c:\Program Files\Positron\resources\app\extensions\positron-supervisor\dist\extension.js:2:76393)
I have tried uninstalling R, Positron, Rstudio, nuking any remaining R folders and reinstalling but have not been able to fix the problem. Rstudio will open and R will work in Rstudio no problem. I'm not sure if this problem is related, but I can't install any source packages. I try and I get this uninformative warning:
> install.packages('dplyr', type = 'source')
Installing package into ‘C:/Users/Mandelbrat/R/library’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/src/contrib/dplyr_1.2.1.tar.gz'
Content type 'application/x-gzip' length 923509 bytes (901 KB)
downloaded 901 KB
The downloaded source packages are in
‘C:\Users\Mandelbrat\AppData\Local\Temp\RtmpUZ9BAm\downloaded_packages’
Warning message:
In utils::install.packages("dplyr", type = "source") :
installation of package ‘dplyr’ had non-zero exit status
I have my Rtools toolchain set up appropriately, I think. I haven't been able to solve this either.
If it's relevant here's my sessionInfo from Rstudio
> sessionInfo()
R version 4.5.3 (2026-03-11 ucrt)
Platform: x86_64-w64-mingw32/x64
Running under: Windows 10 x64 (build 19045)
Matrix products: default
LAPACK version 3.12.1
locale:
[1] LC_COLLATE=English_United States.utf8 LC_CTYPE=English_United States.utf8 LC_MONETARY=English_United States.utf8
[4] LC_NUMERIC=C LC_TIME=English_United States.utf8
time zone: America/Los_Angeles
tzcode source: internal
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.5.3 tools_4.5.3
