`vb` function fails to create the model.

Summary:

vb function fails to create the model.

Description:

I'm using the vb function having previously constructed a Stan model using stan_model, but I get the following error message:

trying deprecated constructor; please alert package maintainer Error in new_CppObject_xp(fields$.module, fields$.pointer, ...) : c++ exception (unknown reason) failed to create the model; variational Bayes not done

Reproducible Steps:

my_stan_model <- stan_model(model_code = my_stan_code)

variational_posterior <- vb(
object = my_stan_model,
data = stan_data,
pars = parameters,
output_samples = 250,
adapt_engaged = F, eta = 0.01)

Current Output:

trying deprecated constructor; please alert package maintainer Error in new_CppObject_xp(fields$.module, fields$.pointer, ...) : c++ exception (unknown reason) failed to create the model; variational Bayes not done

RStan Version:

> packageVersion("rstan") [1] ‘2.17.2’

R Version:

R version 3.4.3 (2017-11-30) -- "Kite-Eating Tree"

Operating System:

MacOS High Sierra 10.13.2

Any help would be most appreciated!

Start by reproducing the supplied stan_model and vb calls in RStan 2.17.2 on the reported R and macOS versions, then trace the vb model-creation path and the deprecated-constructor error. Done means the same model reaches variational Bayes and produces the requested posterior samples without the constructor or model-creation failure.