please when i parallelize my function and this error:"An UndefinedFunction error was thrown on the workers for 'mex'. This might be because the file containing 'mex' is not accessible on the workers Use addAttachedFiles(pool, files) to specify the required files to be attached. See the
documentation for 'parallel.Pool/addAttachedFiles' for more details."
I don't know how to solve this problem please