SOLUTION: To fix this, open [[USERNAME]]/AppData/Local/Spinch

There might be a game_save_3.ini file copy that and name it game_save_1.ini

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Hey, I just bought the game and can't get it to start. I keep getting this error:
___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Create Event
for object obj_build_settings:

Variable obj_build_settings.changed(100730, -2147483648) not set before reading it.
at gml_Script_scr_load
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Script_scr_load (line -1)
gml_Script_scr_load_portwrapper
gml_Script_scr_initialize_game
gml_Object_obj_build_settings_Create_0

Same problem here.
Unfortunately your fix didn't work for me because there isn't any game_save file. Any other ideas to share with me?

edit: Thanks for your hint! Just creating an empty game_save_1.ini file did the magic for me :)