1. Placed the ghost of Factory (blueprint)
2. Moved cursor over the ghost -> Crash.
   Note: It worked before...
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   The mod Mouse-over Construction (1.2.0) caused a non-recoverable error.
   Please report this error to the mod author.

Error while running event MouseOverConstruction::on_selected_entity_changed (ID 54)
The mod Factorissimo 2 - notnotmelon fork (1.0.11) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factorissimo-2-notnotmelon::script_raised_revive (ID 81)
factorissimo-2-notnotmelon/control.lua:779: attempt to index local 'stack' (a nil value)
stack traceback:
factorissimo-2-notnotmelon/control.lua:779: in function <factorissimo-2-notnotmelon/control.lua:775>
stack traceback:
[C]: in function 'revive'
MouseOverConstruction/control.lua:123: in function 'check_selected'
MouseOverConstruction/control.lua:237: in function <MouseOverConstruction/control.lua:224>

I fixed the crash but the mod still does not work well with Factorissimo
It seems that it ignores item-with-tags when placing new entities, which will cause a lot of problems
Nothing I can do about this from my side

I recommend not using these mods together for now

ok, let me review that mod code...

To be more specific,
The factory building currently gets constructed correctly however
The problem is whenever Mouse-over Construction takes the factory item out of my inventory, it just picks a random one without looking at the tags.