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Error when fitting a brms model, maybe associated with Catalina MacOS

Dear list members,

I updated everything, Catalina, Xcode, CLT, R 3.6.2, rstan from source, and
installed the r-macos-rtools, but I still have problems.

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())

Chain 4: Iteration:    1 / 2000 [  0%]  (Warmup)
[1] "Error in sampler$call_sampler(args_list[[i]]) : "
[2] "  c++ exception (unknown reason)"
error occurred during calling the sampler; sampling not done






El jue., 12 dic. 2019 a las 12:51, Balamuta, James Joseph (<
balamut2 at illinois.edu>) escribi?: