threads > 1 in ulam producing a compilation error

[sdaza]

Hello,
I am trying to run this model:

mdata = list(
    mx = test$mx, 
    time = test$time,
    county = test$county
)

f = alist(
    mx ~ normal(mu, sigma),
    mu <- a_cty[county] + b_time_cty[county] * time,
    c(a_cty, b_time_cty)[county] ~ multi_normal(c(a, b_time), Rho, sigma_cty),
    a ~ normal(0, 1),
    b_time ~ normal(0, 0.5),
    c(sigma, sigma_cty) ~ exponential(1),
    Rho ~ lkj_corr(2),
    save> pred <- a_cty[county] + b_time_cty[county] * time
)

model = ulam(
    f, data = mdata, chains = 1, cores = 1, 
    iter = 2000,
    cmdstan = TRUE, 
    threads = 1)

When threads are higher than 1, I got:

Syntax error in '/tmp/RtmpMs4d1l/model-3d5e2f5e7d782b.stan', line 11, column 12 to column 23, parsing error:
   -------------------------------------------------
     9:              vector sigma_cty,
    10:              real sigma,
    11:              corr_matrix[] Rho,
                     ^
    12:              int[] time,
    13:              int[] county ) { 
   -------------------------------------------------

An argument declaration (unsized type followed by identifier) is expected.
make: *** [make/program:47: /tmp/RtmpMs4d1l/model-3d5e2f5e7d782b.hpp] Error 1
Error: An error occured during compilation! See the message above for more information.

Otherwise, the model runs without problems.

[MahShaaban]

I have a similar issue.