Hi Matias,
I'm so sorry for the delays. In between the national emergencies related to COVID-19, I had a few talks to give this month for my PhD updates. I hope you are doing well!
I got the same error you got with the original files you provided. I extracted the foundation tree and it looks like it doesn't have any information about distance.
I'm not sure that this tree makes sense to use as a foundation tree. I could be wrong though.... but the point of having a tree is to have the information about relationships in the form of a numerical distance which this tree doesn't give. Let me know if I'm missing something here.
I'm confused about your last reply. If you have the ghost-tree mentioned there, the same commands are not working for you to get other ghost trees?
Thanks!