Nonlinear ardl in R

I would really encourage you to review the following guide, FAQ: Tips for writing R-related questions.
For example, the guide emphasizes asking coding questions with a reprex. You may have noticed that many people here request issues come in the form of a minimal reprex, that's because asking questions this way saves answerers a lot of time helping you get your issue resolved, reducing the number of back-and-forths requires.

Posting only a screen capture is not helping as much as the all context and a reproductible code. Also we don't see the whole code and don't have access to your data, that may really be needed in this kind of error.