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我只有一点使用 Stan 的经验，并且正在尝试构建一个分层模型。我遇到了一个我以前从未见过的错误，这对我来说完全没有信息。有人知道这里发生了什么吗？我的代码和错误消息如下。

model_default_prior = "
data {
int<lower=0> N;
int<lower=0> n[N];
int<lower=0> y[N];
}
parameters {
real<lower=0> alpha;
real<lower=0> beta;
real<lower=0,upper=1> theta[N];
}

model {
// default prior
target += -5*log(alpha+beta)/2;

// implicit joint distributions
theta ~ beta(alpha,beta);
y     ~ binomial(n,theta);
}
"

rats.dat = list(y = rats$y, n = rats$n, N = nrow(rats))
m = stan_model(model_code=model_default_prior)
r.rats = sampling(m, rats.dat, c("alpha","beta","theta"), iter=10000, 
                  control = list(adapt_delta = 0.9))

"Error in sampler$call_sampler(args_list[[i]]) : " "  c++ exception (unknown reason)"                
error occurred during calling the sampler; sampling not done
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