lol!
ok easy problem, it should automatically fix this when you assign a new shader but for some reason its not.

In hypershade go to the shading groups tab and ctrl drag one of the shading groups from there onto your object.

If you strugle with that method, make a default object select it and your invisible object and then in the hypergraph show the input and ouput connections for both.

Attached to your new object you will see a shading group, middle mouse+ ctrl drag your invisible objects shape node in the hypergraph to the shading network of the other object.

An object cannot assign or link surface shaders without a shading group.