aeiouHolidays are defined but none of the templates use them
If you think this message is appearing erroneously, make sure that it is not caused by one or more of the a-e-i-o-u sets being selected in the Holidays Override property of one of the DiaryGridLines.
This message is usually correct. Q++ does not only look at the tokens in the GridTemplates; it also looks at MiniCal and Slogans settings. It even looks inside thesource code of Macros used by each DiaryGridLine and in its GenTokens Options..
Consequences : You have set Holidays Sets for a Holidays List that will never be used.
•Clear list of Holidays Sets used (recommended) : Automatically clears the list of Holidays Sets used in the corresponding aeiou-Holidays property.
•Change List of Holidays Sets : Opens the corresponding Holidays List property editor, so you can remove references to any Holidays Sets.
•If, on the other hand, you have forgotten to refer to a Holidays List in MiniCals, Slogans, or Macros, then go in the appropriate DiaryGridLine and modify that property.