Case Study: rv-multi.ipynb MCMC sampler RuntimeError: Chain 0 failed

[JosephKarpinski]

Describe the bug
Case Study: rv-multi.ipynb MCMC sampler RuntimeError: Chain 0 failed

To Reproduce
Python 3.8.5
exoplanet.version = '0.5.1'
Run case study rv-multi.ipynb
at https://gallery.exoplanet.codes/tutorials/rv-multi/
Expected behavior
Sampling 2 chains for 1_000 tune and 1_000 draw iterations (2_000 + 2_000 draws total) took 51 seconds.

Your setup (please complete the following information):

• Version of exoplanet: exoplanet.version = '0.5.1'
• Operating system: MacOS Big sur 11.3
• Python version & installation method (pip, conda, etc.): Python 3.8.5 conda environment

Additional context
Add any other context about the problem here.
See attached screen print