I am finally executing my model. I get a

Rejecting initial value:

Log probability evaluates to log(0), i.e. negative infinity.

Stan can’t start sampling from this initial value.

Initialization between (-2, 2) failed after 100 attempts.

Try specifying initial values, reducing ranges of constrained values, or reparameterizing the model.

Initialization failed.

This is after all the data have been fed. How do I find out which statement caused the error?