Got an error after putting together a... thing - 

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ERROR in

action number 1

of Create Event

for object oDialog:

ds_list_size argument 1 incorrect type (undefined) expecting a Number (YYGI32)

at gml_Object_oDialog_Create_0

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gml_Object_oDialog_Create_0 (line -1) 

Also, didn't get any counter for finding the pieces of the thing that needs to be put together. 

Closing & starting the game again did eventually allowed me to finish the case.