It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
 Copy
import crafttweaker.api.capability.Capabilities;

Name	Type	Has Getter	Has Setter
Name ENERGY	Type Capability<IEnergyStorage>	Has Getter true	Has Setter false
Name FLUID	Type Capability<IFluidHandler>	Has Getter true	Has Setter false
Name FLUID_ITEM	Type Capability<IFluidHandlerItem>	Has Getter true	Has Setter false
Name ITEM	Type Capability<IItemHandler>	Has Getter true	Has Setter false