--- Model before optimization --- LML: -493.26572309 Fixed-effect sizes: [ 0. 0. 0.] Variances: covariance0: 1.00000000 covariance1: 1.00000000 covariance2: 1. ...

When running the Poisson regression example, both the full and lazy formulae sample_posterior_predictive errors with the stacktrace below. Only change I made to the example notebook is: with ...