Wheni try to place a Blueprint following error occurs:

Die Mod Loaders Modernized (0.7.9) hat einen Fehler verursacht, der nicht behoben werden kann.
Bitte informiere den Autor der Mod über diesen Fehler.

Error while running event loaders-modernized::on_pre_build (ID 9)
loaders-modernized/scripts/loaders-modernized.lua:159: attempt to index field 'cursor_ghost' (a nil value)
stack traceback:
loaders-modernized/scripts/loaders-modernized.lua:159: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

Can you provide some steps to reproduce. Possibly the save file this is happening in, and the blueprint to use that causes it to crash?

I am unable to get this crash to happen in my save files generating several blueprint and ghost type placements. I'll need to see the actual conditions you save has to see what is causing it to crash.

Never mind. Was able to reproduce it and working on a fix. It happens when the blueprint is in the library. Workaround for now would be to copy the blueprint to your inventory.

I think I have this one squashed. May be some other corner cases.