Associated holidays for aeiou-Namedays are undefined but the option to use them is set
Cause : In the Saints/Namedays Options of the current DiaryGridline you have checked the option to use the holidays rules of a particular Holidays Set with the corresponding aeiou-Namedays, but have not supplied the reference to the holidays set to use. The corresponding portion of the Saints and Namedays editor looks as shown below :
Consequences : Nothing will happen since no recurring holidays will be found. Therefore the Namedays will be displayed as if that option had not been checked.
•Change Saints/Namedays Options : Opens the Saints/Namedays Options property editor, so you can either select a Holidays Set to use or uncheck the option that triggered this message.