Hello, I added the mod to an existing map and I get this error when loading it:

25.673 Script @stdlib/stdlib/core.lua:49: 'event': real number expected got nil.
25.674 Error MainLoop.cpp:1404: Exception at tick 38715900: The mod Picker Inventory Tools (1.1.15) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event PickerInventoryTools::on_tick (ID 0)
stdlib/stdlib/event/event.lua:368: 'event': real number expected got nil.
stack traceback:
[C]: in function 'error'
stdlib/stdlib/event/event.lua:368: in function 'dispatch_event'
stdlib/stdlib/event/event.lua:438: in function <stdlib/stdlib/event/event.lua:396>
25.674 Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "The mod Picker Inventory Tools (1.1.15) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event PickerInventoryTools::on_tick (ID 0)
stdlib/stdlib/event/event.lua:368: 'event': real number expected got nil.
stack traceback:
[C]: in function 'error'
stdlib/stdlib/event/event.lua:368: in function 'dispatch_event'
stdlib/stdlib/event/event.lua:438: in function <stdlib/stdlib/event/event.lua:396>"
25.674 Info ServerMultiplayerManager.cpp:814: updateTick(38715900) changing state from(InGame) to(Failed)
25.679 Quitting: multiplayer error.