Can't Add Storage Pools to Classifications

Hi, I'm receiving this error message:

Set-SCStorageArray : Method not found: 'System.Guid Microsoft.VirtualManager.Re
moting.IVirtualManagerMethods.SetStorageArray(System.Guid,
Microsoft.VirtualManager.Remoting.StorageArrayData,
System.Collections.Generic.Dictionary`2<System.Guid,System.Guid>,
System.Collections.Generic.List`1<System.Guid>, Boolean, System.String)'.

...

ID: 27235

everytime I want to add my storage pool to any classification, I wonder if You have had the same problem or know how to solve it. Thank You in advance.

The provider is an Equallogic.

Windows 2012 R2