ok - hmmm, not much to go on - huh?
when you email an invoice in quickbooks:
a) quickbooks is dependant on having the proper PDF printer drivers (for converting the document from qb format to pdf)
(or)
b) is dependant on having the proper outlook drivers (if trying to use "outlook" option for email delivery
(or)
c) is dependant on having the proper internet explorer drivers (if your trying to use Intuit Email Services)
at the moment, alot of users are reporting problems with windows 7 and compatibility of PDF converter. Could that be your case?
a) If you are using Windows 7 and trying to use PDF - you will find this forum useful:
http://social.technet.microsoft.com/Forums/en/w7itproappcompat/thread/2bd30024-0a64-4f6b-a831-8cb7c1e4cce5
there are three solutions posted:
1. the first solution (has 9 steps) - many users claim works (but the error is not the same as yours)
2. the second solution (has 13 steps) - will work on your error specifically (I know this, because yesturday, I had a client get the same error your getting - AFTER we followed the 9-step instructions.)
3. the third solution, is similiar to intuit's solution, which did not work for us.
If you are a windows 7 users, I would suggest that you try the "13 step" version first.
If you are not using windows 7 or are not using PDF converter, please tell me more about your quickbooks email preferences? are you trying to use Intuit Email Services? or Outlook?