Switching to F8 lightning might solve it?

If you haven't found a solution yet, you could try resetting your Radiant preferences. This is done by pressing 'P', then navigating to system and clicking "Reset Preferences to default".

I had the same problem and noticed that 'p7_door_metal_moorish_01' is a submodel of p7_inf_mausoleum in APE. Treyarch might have forgotten to give us that model. I fixed this in APE by making a copy of the mausoleum, removing the submodel. And using this in my map instead of the original.