Error while exporting to excel

hi...

I am getting the error when I am trying to export to excel file.
the path is as follows:-

Financial Management ---> analysis & reporting ---> analysis by dimension---> function button---> export to excel.

when I am trying to export into excel from analysis by dimension I am getting the following error everytime.
" this message is for C-cal programer"
the called to member add failed. microsoft office excel returned the following message : This command is unavailable because the liscenseto use the apllication has expired.

So kindly give me solution over it.