Hi,
I am a new user of Deformetrica. I installed it and run some of your examples successfully, and then tried for my own data.
I used surface mesh data (.vtk file format), and got this error:

Then I tried to run some command that you provided for another answer in this group as followings to test whether it is the problem of vtk reader, and it gave me the same error as above:

So I assume it is the problem of my vtk file.
Actually my original file was in .stl format, and since your software only support .vtk, I used a software named "meshio" to convert the format. When I read the file through meshio, it seems fine:

Could you provide me some help? Or maybe recommend me another method to convert my stl file to vtk, which is readable from your vtk reader?
Thanks,
Qing