facebook / facebook/prophet

model.fit() with additional regressors prints out weird output

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Description

Hello,
i have trained my Prophet model and everything works out fine. I am just wondering about the output I get when fitting the model (see screenshot). Does anyone knows what this means?
- "" - What does this mean?
- "09:00:09 - cmdstanpy - ERROR - Chain [1] error: error during processing Unknown error
Optimization terminated abnormally. Falling back to Newton." - What could be the issue here?
The weird thing is that these output messages weren't here in previous approaches.

![image](https://user-images.githubusercontent.com/46745783/181459142-6b5c6610-5c19-44ed-9afd-a513f3907f27.png)

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