Exception training model: 'join() argument must be str, bytes, or os.PathLike object, not 'list''.
I am getting the mentioned error, and I don't see why. Can anybody help?

Same happens to me.
There are some possible explanations/fixes mentioned here, but so far none of these work in my case.
https://github.com/d8ahazard/sd_dreambooth_extension/issues/802
Edit: apparently updating the extension my hand by downloading it from here: https://github.com/d8ahazard/sd_dreambooth_extension and overwriting it in the extension directory fixed the issue for me. Also make sure you are using xformers.
Same happens to me.
There are some possible explanations/fixes mentioned here, but so far none of these work in my case.
d8ahazard/sd_dreambooth_extension#802
Edit: apparently updating the extension my hand by downloading it from here: https://github.com/d8ahazard/sd_dreambooth_extension and overwriting it in the extension directory fixed the issue for me. Also make sure you are using xformers.
Thank you, worked for me.