Saturn L300 - Check Oil Light

Hi,
We just got our oil changed yesterday and now notice a "check oil" indicator. I checked the oil level and it is fine. Any clue as to why this would come on?

In the fuse box,there is a reset oil button.Push that button down for 5 seconds with the key on,engine off.It should say on the cover for the fuse box under the hood.It shold go out after pushing that button for 5 seconds