Modeling error about IDASolve

Hi CADET team,

I am trying to simulate elution profiles, but I got the following errors. The parameters are obtained from this paper (Journal of Chromatography A, 1586 (2019) 40–51) except the parameters for buffer.

The original code is also attached here.
Displacement chromatography-v3.ipynb (9.6 KB)
If I remove the first component (the buffer), the simulation works, but the result is not what I am expecting. Any help is much appreciated.

Thanks in advance,