Hi everyone, I have a very weird bug on Stan, where I cannot run my model and I cannot figure out why. I get the following error message:

```
Error in stanc(file = file, model_code = model_code, model_name = model_name, :
0
Syntax error in 'string', line 16, column 33, lexing error:
Invalid character found.
```

I think the error pertains to the path of my stan model file, but I tried multiple ways of expressing it and it never works. Does anyone have any idea what could be causing this? (Yes, I tried to uninstall and reinstall the package). This is the code I run:

```
stan.model <- stan(file = model.path, data = stan.data)
```

That error is for a syntax error in your Stan code

But I can’t understand what it could be, also line 14 is an empty line. This is the very simple code of the model I am using. Whenever I get errors in the model, I usually get a different error message.

```
data {
int<lower=0> N; // num observations
vector[N] y; // outcome
vector[N] se; // vector of standard error estimates
}
parameters {
real t; // common mean for the theta's
vector[N] theta; // vector of RCT-specific ATE's
real<lower=0,upper=pi()/2> sigma.theta.unif;
}
transformed parameters {
// Here we use the fact that if X is uniformly distributed on an appropriate
// support (0, pi/2), then Y=tan(X) is distributed as a half-Cauchy random
// variable. We perform this transformation because is computationally more
// efficient for Stan to sample from a uniform than from a Cauchy with thick
// tails.
real<lower=0> sigma.theta = tan(sigma.theta.unif);
}
model {
// Likelihood or 1st hierarchical layer
y ~ normal(theta, se);
// 2nd hierarchical layer
theta ~ normal(t, sigma.theta);
// 3rd hierarchical layer
t ~ normal(0,2);
sigma.theta.unif ~ uniform(0,pi()/2);
}
```

Drop to dots in variable names.

Yes I figured, it’s weird that it’s not allowed. Thanks a lot for the help.