javascript - D3 - nest.entries() throws Uncaught TypeError -


i've tried purloin mike's excellent stacked area chart replacing own data, , hell has broken loose in way don't encounter @ level of example adaptation. specifically, throws @ console:

uncaught typeerror: cannot read property '1' of undefined

that's in reference innocuous line implements stack function:

var layers = stack(nest.entries(data));

my data schema matched of example - 1 difference being "date" has 4-digit year, i've accounted 

d3.time.format("%m/%d/%y");

i can't figure out why 'nest.entries(data)' coming undefined, or why stack function asking property called "1". assistance appreciated.

attempted chart here: http://bl.ocks.org/wboykinm/10499388

make sure have same date represented each group, this:

date,key,value 1/4/2013,phone,549 1/4/2013,email,402 1/4/2013,url,620 8/4/2013,phone,165 8/4/2013,email,265 8/4/2013,url,52 15/4/2013,phone,300 15/4/2013,email,145 15/4/2013,url,450 ...

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