Override to return the correct error message for the invalid state of the data. This message will be printed on the chart for the user.
'Declaration
Function GetDataInvalidMessage() As String
string GetDataInvalidMessage()
Return Value
An error message indicating why chart data is not valid for the layer.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
