i run in to a issue by adding a fluid to a existing material with the sample from the wiki
addFluid(GTMaterials.Sodium, $FluidStorageKeys.LIQUID); // Can be LIQUID, GAS, PLASMA or MOLTEN
let addFluid = (mat, key) => {
let prop = new $FluidProperty();
prop.getStorage().enqueueRegistration(key, new $FluidBuilder());
mat.setProperty(PropertyKey.FLUID, prop);
}
feedback in game : Error in 'GTCEuStartupEvents.registry': TypeError: addFluid is not a function, it is undefined.

