<CellRangeList> error on trying to publish an excel workbook

[Michael]

I have a simple workbook that contains three cells being used for common
dropdown lists. The cells that reference this list are conditionally
formatted dependent on the cell value. When I try to save the workbook as a
webpage (Publish) I receive an error stating "Validation Load Error: For Type
List, absence of a <CellRangeList> tag implies relative cell references in
the list values which is not allowed.

Any ideas

Michael