Thank you for the example files.
I tested them on my computer and it works:
It looks like you work on MacOS, and I suspect that you haven't compiled the library. I made the instructions more explicit in the tutorial:
https://neuroimage.usc.edu/brainstorm/Tutorials/Decoding#Download_and_installation
I added a test to make the error message more explicit than what you got:
process_decoding_svm: New error message when libsvm must be compiled · brainstorm-tools/brainstorm3@aab5862 · GitHub
