Error using Document and Folder Browser Component "(not available as [])"

When trying to use the Document and Folder Browser Component in a blank interface expression I get the following error:

Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!documentAndFolderBrowserFieldColumns [line 8]: Invalid function a!documentAndFolderBrowserFieldColumns (not available as [])

I am using the exact code given in the documentation example found at:

https://docs.appian.com/suite/help/17.4/Document_and_Folder_Browser_Component.html

The only substitution that I have made is changing the following:

local!rootFolder: cons!REPORTS_FOLDER to 

local!rootFolder: cons!MY_FOLDER (single value of folder type)

So I can't understand where the array error is coming from. I am using the cloud version of Appian 17.3.

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