Great, but some levels are fastidious and until you get this message:
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FATAL ERROR in
action number 1
of Step Event0
for object obj_player:
Unable to find any instance for object index '16' name 'obj_portal_exit'
at gml_Object_obj_player_Step_0
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--------------------------------------------------------------------------------------------
stack frame is
gml_Object_obj_player_Step_0 (line -1)