Copying worksheet problem
 

Hi,
I have been given two workbooks to merge each with about 10 worksheets
containing about 5 graphs each.
When I try to move a worksheet from one workbook into the other I get this
error message:
No more new fonts may be applied in this workbook.
Does anyone out there have any ideas what to do?
I have tried going to format and styles but can't seem to get past it.
When I receive the message I can then only close it by going to task manager
and ending the programme that way.
Hope someone out there can help me.
Thanks.