There may be other issues, but from what I can tell, one of them is that you've registered a non existent element as a collapsible DIV inside the initialization code of the script:
Code:
animatedcollapse.addDiv('1', 'fade=1,group=p')
animatedcollapse.addDiv('2', 'fade=1,group=p')
animatedcollapse.addDiv('3', 'fade=1,group=p')
animatedcollapse.addDiv('4', 'fade=1,group=p')
animatedcollapse.addDiv('5', 'fade=1,group=p')
animatedcollapse.addDiv('6', 'fade=1,group=p,persist=1')
animatedcollapse.addDiv('7', 'fade=1,group=p')
animatedcollapse.addDiv('8', 'fade=1,group=p')
The element with ID="2" doesn't exist on the page. You should either remove the line in red above, or define the element.
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