Closing Excel when running keyword tests

Hi, i have tried again excel still doesn't close on playback however i do get a failure:-



The Object Does Not Exist



An error occurred when executing the "Close" method or property of the
"NetUIHWND" object.

The object or one of its parent objects was not found in
the system.



Tested Object

------------------

Alias:
Aliases.EXCEL.wndXLMAIN.EXCEL2.tb_Ribbon.Ribbon.NUIPane.NetUIHWND

Mapping
item:
NameMapping.Sys.EXCEL.wndXLMAIN.EXCEL2.tb_Ribbon.Ribbon.NUIPane.NetUIHWND



Missing
Object

------------------

Alias: Aliases.EXCEL

Mapping item:
NameMapping.Sys.EXCEL



Any ideas?

Thanks James