Resources.Load doesnt' find the assets

I’m trying to load and instantiate the prefab but I can’t figure out how Load works. I’m using the function like this:

GameObject prefab = (GameObject)Resources.Load("/Prefabs/fenceLow", typeof(GameObject));

My folder with prefabs looks like this:
26163-resources.load.png

Do you know how to use it properly? Thanks.

They must be in a master folder named Resources, eg

Assets > Resources > Prefabs

All assets that are in a folder named “Resources” anywhere in the Assets folder can be accessed via the Resources.Load functions. Loads an asset stored at path in a Resources folder. The path is relative to any Resources folder inside the Assets folder of your project.