Unable to use from_dataset in any way

I am trying to use from_dataset (using an example almost identical to what is in the help/formulas file).

The public URL is here:

I don’t know if that even works though (it doesn’t for me) so here is a screenshot:

I am getting the same error in every row (with the exception of the id being different, of course):

“Error evaluating from_dataset(“Security”, “name”, “{“id”:“20”}”): undefined method `sub’ for nil:NilClass”

I know it is finding the dataset because if I change that I get a different, actually helpful, error.

Any help would be appreciated.

When I set up my field, I kept getting that error. I eventually changed my dataset to CSV type and it seemed to fix the problem. Not sure why other formats weren’t working.