This message is only generated if the current template is set to allow a grid split (that is to say, try to make the grid splittable), in which case the design-time message 187525 will also be generated.
If the template from which this message originates is set to allow a grid split, then determine if you really need to allow this grid to split and, if not, change that setting.
This message can be generated if none of the tokens on the page has a DayValue, such as would be the case with a single [yyyy] token at the top of a recap or notes page.
To avoid ambiguity, change that token to either [1yyyy] (if the grid is based on the first of the month or the first of the year) or [8yyyy] (if your grid is based on the Monday before the first of the month or the first of the year).
If solutions 1 and 2 are not relevant, refer to the help topic 174500 for a detailed explanation of the possible causes for, and the solution to, the issue causing both the present message and message 174500.
Topic 174501, last updated on 05-Jul-2023