Horizon View 6.1 Issue

Guys using View 6.1 in a test lab getting an error when im trying to create a new pool, im clicking to in vCenter Setting to grab a snapshot and i get this java error, have attached the picture

Server Error

java.lang.NosuchMethodError:

com.vmware.vim25.SelectionSpec.<init>(Ljava/lang/String;[Lcom/vmware/vim25/DynamicProperty;Ljava/lang/String;)V

Any help would be appreciated.

Regards

Paul