Setting boundaries for prior distributions

Questions
3

Thank you for reply, here is the full error message:

SamplingError: Initial evaluation of model at starting point failed!

Starting values:

{'sigma__log__': array(-7.36189677), 'mu_': array(0.00395141)}

 

Initial evaluation results:

sigma_ _log__     -0.77

mu_               6.57

observed_data_    -inf

Name: Log-probability of test_point, dtype: float64

this error occurs when it enters the trace part (sample) of code