If validation feedback appears in a pop-up, what does this indicate about the error?

When validation feedback appears in a pop-up, it suggests that the associated attribute is not visible on the page. This situation often occurs when a field that requires user input or validation is either hidden or rendered in a way that does not allow direct interaction. Pop-ups serve as a way to alert the user to issues that otherwise might not be easily identifiable due to the attribute's invisibility or absence from the interface.

In contrast, if validation feedback were displayed directly beside the input field or in-line, it would typically indicate that the input is actively being addressed and is easily accessible for adjustment. The appearance of a pop-up signifies a need to draw attention to the issue that might not be caught immediately by the user due to the layout of the page. Therefore, this method of error indication is particularly useful for guiding users when elements are obscured or not front-and-center in their interaction with the application.