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It's actually a text field, you have it as a custom error message in the form. It's showing up in the form because your conditional is set to show it when the calculation is equal to zero.
The total is a calculation of the two date fields in the form. When the second date field in not filled, the error will show up. I think this is also causing the issue with the page break. Please check. I would suggest revising the condition or remove it.