Why does my instax mini have three lights flashing?
According to the manual, you need to replace all the batteries with fresh ones, preferably camera ones, and all the same power/brand.
See the Flickr thread about this - seems like this works some of the time, so if it doesn't work first time, try switching to another set of four batteries and see if it's fixed.
http://www.flickr.com/groups/instax/discuss/72157622943415896/
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