Cannot obtain the security descriptor of the "Domain EXServers" group   

i have make a workflow project, but i can not run the project."This
process requires a connection to your Microsoft Exchange Server." The
error in the Application log of the
production server is as follows:  "Cannot obtain the security
descriptor of the "Domain EXServers" group.
what can i do ? 

Any ideas? 


Thanks,

date: 12 Jun 2006 20:25:52 -0700   author:   Mint