Had to remove a mod (Atomic Overhaul) as it interfered with Exotic Industry's nuclear setup.

On trying to access the machines tab from the fabricator window, I get this error:

Error while running event quantum-fabricator::on_gui_click (ID 1)
Unknown sprite "item/heat-furnace"
stack traceback:
[C]: in function 'add'
quantum-fabricator/scripts/gui/fabricator.lua:326: in function 'build_main_recipe_item_list_gui'
quantum-fabricator/scripts/gui/events.lua:74: in function <quantum-fabricator/scripts/gui/events.lua:64>

Is there a way to rebuild the index of placeable entities?

Should be fixed now.

The original error is fixed, but now I'm encountering this one:

Error while running event quantum-fabricator::on_init()
quantum-fabricator/scripts/events.lua:204: attempt to index field 'planet_surface_link' (a nil value)
stack traceback:
quantum-fabricator/scripts/events.lua:204: in function 'initialize_surface'
quantum-fabricator/scripts/events.lua:183: in function 'initialize_surfaces'
quantum-fabricator/scripts/process_data.lua:9: in function 'process_data'
quantum-fabricator/scripts/events.lua:129: in function <quantum-fabricator/scripts/events.lua:45>

EDIT: Loaded a previous save, that had the mod. Saved it, removed mod, loaded it, and now everything works. Could have been stale data.

This particular crash seem to only happen when my mod is enabled for the first time in a save with Factorissimo factory floors already present. Should be fixed as well, for the future.