Hi guys,

I am trying to fit a regression model to my data. But I keep receiving this error message:

```
Chain 1: Rejecting initial value:
Chain 1: Error evaluating the log probability at the initial value.
Chain 1: Exception: validate transformed params: mu[1] is nan, but must be greater than or equal to 0 (in 'model32b08805100_tweedie' at line 63)
Chain 1:
Chain 1: Initialization between (-2, 2) failed after 100 attempts.
Chain 1: Try specifying initial values, reducing ranges of constrained values, or reparameterizing the model.
[1] "Error in sampler$call_sampler(args_list[[i]]) : Initialization failed."
[1] "error occurred during calling the sampler; sampling not done"
```

How can I solve this problem?

I really need your help.

Many thanks