Your network contains the servers configured as shown in the following table.

You run the New-DatabaseAvailabilityGroup cmdlet and you receive the following error message.
The task was unable to create the default witness directory on server FS01. Please manually specify a witness directory.
+ CategoryInfo : InvalidArgument : (:) [New-DatabaseAvailabilityGroup], DagFswUnableTob...ectoryException
+FullyQualifiedErrorId : [Server=EX01, RequestId-81b106a2-21e7-4ac3-8a23-e2e13e54a9fa, TimeStamp=11/13/2015 3:09:02 PM]
[FailureCategory=CmdletDagFswUnableToBindWitnessDirectoryException]
166B6E12, Microsoft. Exchange. Management. SystemConfigurationTasks.
NewDatabaseAvailabilityGroup
+PSComputerName : EX01.contoso.com
You need to ensure that you can create the database availability group (DAG) successfully by using the New-DatabaseAvailabilityGroup cmdlet.
What should you do?