Could not connect to the Exchange Server

Could not connect to the Exchange Server

Our ManageEngine AdManager Plus version is 6.2.0 and we use Exchange Server 2010.
I try selected user create email on 'AD Mgmt-> Exchange Tasks-> Create/Archive User Mailboxes' 
But i had following error 'Could not connect to the Exchange Server'
How can i create email on manageengine admanager ?