Pipeline to create Sharepoint folders

Thank you so so much! After a ton of trial and error yesterday, this is basically what I have set up... The issue I'm running into though is that the pipeline just gives me an error message whenever it encounters an "empty list" of folders. It tells me that one of the arguments is invalid, but when I test it where I know all the folders exist it works just fine. Have you experienced this? I have a support ticket open on it, but I wonder if it's a common issue.