How to use classification explainer for custom models?

I've just been introduced to your package (it is so helpful).
I have a question regarding the classification explainer. I've fine-tuned a distilbert model on a specific dataset with my own designed classifier (several fc layers) on top of that (so, my model is not in the pretrained bert models):

when I try to use the package to interpret outcomes, it gives this error:
`'Distilbert' object has no attribute 'config'.`
How should I fix that?
Thanks