When I Open the survey from the Link icon I get an error message:

Error loading survey.
Error Message:
FormLogicError: Could not evaluate #, message: The expression is not a legal expression. (line: undefined, character: undefined)
Please contact the survey author.
I Click 'Close' and the survey opens but wherever a field is only relevant if a previous field value is a certain value the field is not there:

Thanks in advance for any help offered.