The most likely cause is that your license environment variable is not defined correctly or you don't have the proper license.
Here are some resources that may help: http://communities.mentor.com/docs/DOC-2873
Note: If you are current on Support, you can open a service request on SupportNet.
Mentor Graphics Customer Support
I have already figured out and solved the issue many days ago. Thanks.
Hardware and test Engineer
Tranzeo wireless technologies Inc.
19473 Fraser Way, Pitt Meadows, BC, Canada
I found the sever PC that installed the lisence not powered up. When I powered up that PC, problem solved.