The function 'isnullorempty_appian_internal' is unavailable

Question

In a PM, getting the below error, how can I resolve this?

Mike Schmitt · Accepted Answer

yes, that would do it. you'll need to replace that with the primitive function "isnull()" unfortunately. at least, until Appian fixes this bug.

Mike Schmitt · Answer

If you're using a!isNullOrEmpty() in a Rule node (and potentially other places in process models concerning decision logic, like timer conditions), unfortunately this is a known issue that I reported to Appian a few years ago and still hasn't been addressed.

Mike Schmitt · Answer

I think you'll be looking for a place where you've used the newer function a!isNullOrEmpty() (and maybe alternately a!isNotNullOrEmpty()). Your error message (as far as i've seen) has to do specifically with these newer functions. The code you've posted here using older functions should not be causing any such error that I know of. 
 (BTW: Stylistically, we don't usually usually use the "fn!" prefix in front of legacy functions, outside of being called by looping functions anyway, though AFAIK it shouldn't break anything like seen in your original error message.)

The function 'isnullorempty_appian_internal' is unavailable

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