Using function ACFManagement.RECALCFIELDS shows an error message Unknown Automation Server. Unknown Class." ... in your Dynamics NAV 2009 system.
Something simlilar like this message:
The function RECALCFIELDS requires the Anveo Automation to be registered.
Note: In Dynamics NAV 2009 Classic Client business code in run directly in Classic Client and not on a central server. If you run RECALCFIELDS on a client machine and not on the server, the automation must be installed on the client as well.
Register the automation like described in installation documentation.
Hint: If you need the function on each client, mark records to be recalculated instead of do an instant recalculation. Use a NAS to do recalculations on a server every x minutes.