Your model has a bunch of problems. As Box indicates there are no components in your model. There are groups. In addition, the shelves at the back and the case sides are each a bunch of loose geometry in a common group container. They need to be separate. And your drawer fronts are just loose geometry.
I use a different cut list extension. Here’s how your model reports using it. The huge dimensions for some of the groups are due to the fact that you opened the group for editing and copied the geometry to make the other parts instead of simply copying the groups.
I redrew your model correctly using components. (I did remove the materials for appearance sake.) Here’s how my version of your model reports with components that are modeled correctly and have useful names.
Cabinet 12.28.20 with components.skp