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FATAL ERROR in
action number 1
of Step Event0
for object obj_boss_1:
Unable to find any instance for object index '101664'
at gml_Object_obj_boss_1_Step_0
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stack frame is
gml_Object_obj_boss_1_Step_0 (line -1)
So far so good, after defeating the first boss, I am getting a crash, I have checked for a new build and that did not help.