I have two files for running:
The first one is a script I named preambulo.m which runs ok. The second one is a function which I named final_project_mc.m, when I run this file, it appears the error that I mentioned in the initial question, and I don't know why this is happening. In order to do this exercise you need to run first preambulo.m and then final_project_mc. M.
I would really appreciate any help with this problem.