That’s just how GM:S reports errors originating from Room Creation Code, e.g. put show_error("!",1) in Room Creation Code of a brand new project and it’ll say
___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of PreCreate Event
for object obj_test:
!
at gml_Room_rm_test_Create (line 2) - show_error("!",1)
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Room_rm_test_Create (line 2)
where obj_test is the object on the top of your resource tree.
I’ve not gotten around to looking at your project yet