Hey @tourette95
Thanks for the reminder, sorry for late response.
Yes, I was checking it, it seems that we could still use the current version, with the latest version of iso2mesh.
I think the error is due to multiple version of iso2mesh in your matlab path.
Could you remove all the previous versions of iso2mesh, make sure that there is not other old version on matlab path, some tools include by default some iso2mesh functions.
After that, download the latest version of iso2mesh from the github ,https://github.com/fangq/iso2mesh, unzip it and add it to Brainstom,
or just let brainstorm install it for you https://neuroimage.usc.edu/brainstorm/Tutorials/Plugins
Then try again to generate the FEM mesh, it should work.
Let me know the results.
thanks 