Trying to ""Count"" the number of selections in a multi-select text field

It seems that the above solution has worked for people previously, but I am having a hard time with it. When I insert my multi-select text field after the ToText command, I get an error stating that was not expecting a textlist. It will still save, but doesn't return any results. I'm fairly new to this platform, so I'm not sure if I'm just doing something wrong or if this really isn't possible. Any help you can offer would be greatly appreciated. Thanks