Can't Erase or delate in SpectraLayers8

What does it mean when I get ‘You can only delete from a layer, not a group’?
Situation:
I have a ‘pop’ in a song.
I unmixed Stems and found the problem to be in the drums. I Soloed the Drums and I can isolate the area, but I can’t erase or delete.
I 'm stuck.
I appreciate any guidance…

In SpectraLayers, look at the panel on the right-hand side; click “Layers”.
You should be seeing the seperated layers underneath the “group” which was your original.
Select (click) the layer (drums) before selecting the piece you want to delete.