Using DLookup inside a user-defined function which is inside a query

Access gurus,
I am not sure if using DLookup inside a user-defined function and then
using that function inside a query is forbidden. When I did that, the
following error is encountered;

"Cannot open a form whose underlying query contains a user-defined
function that attempts to set or get the form's RecordsetClone
property"

I never use RecordsetClone property in my code. Does anyone have any

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