If you are using RunUO 2.x you will need to edit GoldPanningSystem.cs and remove line 111:
new BonusHarvestResource( 100, 2.0, 1113349, typeof( DelicateScales ) ),
This does not exist in MiscMLResources.cs in RunUO 2.x it will throw an error.
The attached copy is the edited version for RunUO...