Adding another .csv file to PSO example

Hi! Really appreciate Mr. Jingwei Too for this. I tried the file Demo_PSO with ionosphere.csv and it ran perfectly well... But when I replaced the ionosphere.csv file with another file, there was an error occur:

ValueError: Unknown label type: continuous. Maybe you are trying to fit a classifier, which expects discrete classes on a regression target with continuous values.

How to solve this problem?