The mod Fill4Me (0.10.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Fill4Me::on_configuration_changed
Fill4Me/stdlib/event/event.lua:156: Invalid player specification (player doesn't exist).
stack traceback:
[C]: in function 'error'
Fill4Me/stdlib/event/event.lua:156: in function 'dispatch'
Fill4Me/stdlib/event/event.lua:52: in function <Fill4Me/stdlib/event/event.lua:49>

I do use Krastorio 2 and Space Explorations mods.
This occurs while trying to load a save into the map editor V1.1.x latest experimental

Same here. Factorio v1.1.12. Starting a new scenario in the editor works fine, but trying to load it crashes.

Just got the same error !

20.605 Error ServerMultiplayerManager.cpp:91: MultiplayerManager failed: "The mod Fill4Me (0.10.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Fill4Me::on_configuration_changed
Fill4Me/stdlib/event/event.lua:156: Invalid player specification (player doesn't exist).
stack traceback:
[C]: in function 'error'
Fill4Me/stdlib/event/event.lua:156: in function 'dispatch'
Fill4Me/stdlib/event/event.lua:52: in function <Fill4Me/stdlib/event/event.lua:49>"
20.605 Info ServerMultiplayerManager.cpp:780: updateTick(4294967295) changing state from(CreatingGame) to(InitializationFailed)
20.605 Info CommandLineMultiplayer.cpp:209: Exit point.
20.613 Info ServerMultiplayerManager.cpp:140: Quitting multiplayer connection.
20.613 Info ServerMultiplayerManager.cpp:780: updateTick(4294967295) changing state from(InitializationFailed) to(Closed)
20.651 Info UDPSocket.cpp:218: Closing socket
20.653 Goodbye

The mod Fill4Me (0.10.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Fill4Me::on_configuration_changed
Fill4Me/stdlib/event/event.lua:156: Invalid player specification (player doesn't exist).
stack traceback:
[C]: in function 'error'
Fill4Me/stdlib/event/event.lua:156: in function 'dispatch'
Fill4Me/stdlib/event/event.lua:52: in function <Fill4Me/stdlib/event/event.lua:49>

Same