Mixing chemicals problem !

[Apjjm]

Hey! Can anybody help me I'm stuck with this chemical puzzle thing. Damn.

Is your oven called "extraction_oven_1" or "extaction_oven_1"?

Extaction_oven_1? What about that?

I was guessing you made a typo in the script, because calling the object in the map "extraction_oven_1" would make more sense considering you spelled it correctly everywhere else? You might want to double check that the names are exactly the same including case. Failing that, it is most likely still a problem with the callback being triggered in the first place. You will want to put debug messages in your script, one per function, to track what is actually getting triggered.