Langmuir breakthrough and elution profiles generation

I want to replicate the results of this paper’s Langmuir isotherm profile and elution profile using Cadet Python (Predictive mechanistic modeling of loading and elution in protein A chromatography - ScienceDirect).

However, I get an error when plotting the results

.

Can you please assist? Below is the actual code I am working on
bhyoyarBreakthrough_curves.ipynb (14.8 KB)
Bhoyarpaper replicate_elution.ipynb (40.8 KB)