I am experiencing the error below when previewing the questionnaire
FormLogicError: Could not evaluate: $(HOW OLD ARE)>18, message: not sure how to handle expression called on nodeset that doesn’t start with a ‘/’: OLD{“stack”:[{“t”:“root”,“tokens”:},{“v”:“$”,“t”:“fn”,“dead”:false,“tokens”:[{“t”:“arr”,“v”:}]}],“cur”:{“v”:“OLD”}}
There might be a problem with variable names. Names cannot contain blanks. So “HOW OLD ARE” is not a valid name. (Is this even the label, which would be an invalid $ reference?) A reference must also contain curly brackets ${varName}, not normal ones (…).
Did you check your form with the Online validator, please? This is always recommended during form development and before testing and deployment.