Thank you for your quick reply. No, there isn’t a nan in my data. But your question did help me to look for other “stupid” mistakes instead of questioning the sampling or modeling parameters. After making some other adjustments to my code, I have been able to get the sampler to run successfully. Now I can focus on the parameters and sampling to fine tune the model. (I’m going to delete this question though so it doesn’t pop up in someone’s search.)
Thanks Again!