Znote/ZnoteAAC — pull request #181 by forgee (2014-11-30 16:11:23+00:00)
Title: Update special/database2znoteaac.php

I have seen this pop up several times, most recently here : http://otland.net/threads/znote-aac-compatibility-converter.225049/
I looked through the code and found that it was passing an array instead of the account id.