got some error with stack.

[Webonaute]

I got this error when I try to use epichal.

[Thu Apr 23 2015 19:11:08 GMT-0400 (EDT)] ERROR TypeError: Cannot read property 'length' of undefined
at SlackBot.send (/home/Projects/fun/node_modules/hubot-slack/src/slack.coffee:201:22)
at Response.send (/home/Projects/fun/node_modules/hubot/src/response.coffee:22:5)
at /home/Projects/fun/node_modules/hubot-epichal/src/epichal.coffee:63:13
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:177:14
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:412:17
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:254:17
at async.each (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:121:20)
at _asyncMap (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:248:13)
at Object.map (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:219:23)
at Object.async.sortBy (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:394:15)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:163:11
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:254:17
at done (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:135:19)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:32:16
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:251:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:1065:26
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:277:13
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:157:25
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:274:17
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:1061:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:151:9
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:410:7
at EpicHAL.addPunctuationToWords (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:426:12)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:408:10
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:525:46
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:254:17
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:151:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:251:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:615:34
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:516:25
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:401:14
at EpicHAL.wordsFromNorms (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:469:12)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:393:10
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:515:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:610:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:249:17
at iterate (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:149:13)
at async.eachSeries (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:165:9)
at _asyncMap (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:248:13)
at Object.mapSeries (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:231:23)
at Object.async.series (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:608:19)
at wrappedTask (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:523:19)
at Object.async.retry (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:529:27)
at EpicHAL.rewrite (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:392:9)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/epichal.js:149:12
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:1058:20
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:272:13
at iterate (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:149:13)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:160:25
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:274:17
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:1061:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/model.js:75:16
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:693:24
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/model.js:61:18
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/storage/redis.js:104:5
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:254:17
at done (/home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:135:19)
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:32:16
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/node_modules/async/lib/async.js:251:21
at /home/Projects/fun/node_modules/hubot-epichal/node_modules/epichal/src/storage/redis.js:59:14
at try_callback (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/index.js:592:9)
at RedisClient.return_reply (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/index.js:685:13)
at ReplyParser. (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/index.js:321:14)
at ReplyParser.EventEmitter.emit (events.js:95:17)
at ReplyParser.send_reply (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/lib/parser/javascript.js:300:10)
at ReplyParser.execute (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/lib/parser/javascript.js:211:22)
at RedisClient.on_data (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/index.js:547:27)
at Socket. (/home/Projects/fun/node_modules/hubot-epichal/node_modules/redis/index.js:102:14)
at Socket.EventEmitter.emit (events.js:95:17)
at Socket. (stream_readable.js:746:14)
at Socket.EventEmitter.emit (events.js:92:17)
at emitReadable (_stream_readable.js:408:10)
at emitReadable (_stream_readable.js:404:5)
at readableAddChunk (_stream_readable.js:165:9)
at Socket.Readable.push (_stream_readable.js:127:10)
at TCP.onread (net.js:526:21)