Your field code doesn't have a valid syntax. Delete:
Y* MERGEFORMAT
and replace it with, for example, any of:
• \@ "dddd, d MMMM yyyy";
• \@ "ddd, d MMMM yyyy";
• \@ "d MMMM yyyy";
• \@ "d MMM yyyy";
• \@ "dd/MMM/yyyy";
• \@ "d-MM-yy".

Note: You can swap the d, M, y expressions around, but you must use uppercase 'M's for months - lowercase 'm's are for minutes.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]