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FATAL ERROR in
action number 1
of Create Event
for object objSaveSlot:

ds_list_read argument 2 incorrect type (undefined) expecting a String (YYGS)
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called from - gml_Script_LoadGetBasicData (line 27)
called from - gml_Object_objSaveSlot_Create_0 (line 12)
called from - gml_Object_objMainMenuControl_Create_0 (line 13)

Why does this happens?

I played the game only once.