I have a grid that uses the UltraWebGridExcelExporter.Export(UltraWebGrid, ExcelWorkbook) method, and worked until this morning.  I can't find anything that has changed in the configuration of the grid, but the method call above returns this exception:

System.ArgumentOutOfRangeException: Outline level must be between 0 and 7. Parameter name: value Actual value was 8.

There are no manual settings for OutlineLevel and it is not a hierarchical or grouped grid.

Any ideas on why I'm getting this exception?

Thanks,

Jeff