ErrorMessage Property

Returns or sets the data validation error message. Read/write String.

Example

This example adds data validation to cell E5 and specifies both the input and error messages.

With Range("e5").Validation
    .Add Type:=xlValidateWholeNumber, _
        AlertStyle:= xlValidAlertStop, _
        Operator:=xlBetween, Formula1:="5", Formula2:="10"
    .InputTitle = "Integers"
    .ErrorTitle = "Integers"
    .InputMessage = "Enter an integer from five to ten"
    .ErrorMessage = "You must enter a number from five to ten"
End With