What worked for me was installing the tools using
https://github.com/rmacoslib/r-macos-rtools/releases
and then installing rstan from source ie install.packages(“rstan”,type=“source)
as suggested on one of the stan forums
Ken
> On 11 Dec 2019, at 11:09 am, Manuel Spínola <mspinol...@gmail.com> wrote:
>
> Dear list members,
>
> When trying to fit this example from the CRAN repository fro brms, I got
> the following error message after the 4th chain. I am using R 3.6.1 in
> Catalina MacOS.
>
>
> library(brms)
>
> group <- rep(c("treat", "placebo"), each = 30)
> symptom_post <- c(rnorm(30, mean = 1, sd = 2), rnorm(30, mean = 0, sd = 1))
> dat1 <- data.frame(group, symptom_post)
>
> fit1 <- brm(bf(symptom_post ~ group, sigma ~ group),
> data = dat1, family = gaussian())
>
>
> [1] "Error in sampler$call_sampler(args_list[[i]]) : "
> [2] " c++ exception (unknown reason)"
> error occurred during calling the sampler; sampling not done
>
> I think is a problem with Catalina MacOS, but I don´t know how to solve it.
>
> Manuel
>
> --
> *Manuel Spínola, Ph.D.*
> Instituto Internacional en Conservación y Manejo de Vida Silvestre
> Universidad Nacional
> Apartado 1350-3000
> Heredia
> COSTA RICA
> mspin...@una.cr <mspin...@una.ac.cr>
> mspinol...@gmail.com
> Teléfono: (506) 8706 - 4662
> Personal website: Lobito de río <https://sites.google.com/site/lobitoderio/>
> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/>
>
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