run 'nico build' error

[wushujun]

wusjtekiiMac:blog wusj$ nico build

       nico: 0.4.7
       load: nico.json

/usr/local/lib/node_modules/nico/lib/sdk/markdown/_share.js:34
if (language.slice(0, 6) === 'iframe') {
^
TypeError: Cannot call method 'slice' of null
at Renderer.exports.blockcode (/usr/local/lib/node_modules/nico/lib/sdk/markdown/_share.js:34:16)
at Parser.tok (/usr/local/lib/node_modules/nico/lib/sdk/markdown/_lib.js:895:23)
at Parser.parse (/usr/local/lib/node_modules/nico/lib/sdk/markdown/_lib.js:838:17)
at Function.Parser.parse as parser
at hlMarkdown (/usr/local/lib/node_modules/nico/lib/sdk/markdown/marked.js:20:13)
at Object.exports.normalRender (/usr/local/lib/node_modules/nico/lib/sdk/markdown/_share.js:71:10)
at Object.exports.render (/usr/local/lib/node_modules/nico/lib/sdk/markdown/marked.js:24:16)
at Object.exports.read (/usr/local/lib/node_modules/nico/lib/sdk/post.js:101:18)
at /usr/local/lib/node_modules/nico/lib/sdk/post.js:188:22
at /usr/local/lib/node_modules/nico/lib/sdk/file.js:82:7

• nico.json

{
  "source": "content",
  "output": "_site",
  "theme": "_themes/one",
  "sitename": "XXX",
  "siteurl": "http://XXX.github.io",
  "permalink": "{{directory}}/{{filename}}",
  "writers": [
        "nico.PostWriter",
        "nico.PageWriter",
        "nico.FileWriter",
        "nico.StaticWriter",
        "nico.ArchiveWriter",
        "nico.YearWriter",
        "nico.TagWriter",
        "nico.DirectoryWriter",
        "nico.FeedWriter"
    ],
  "perpage": 20,
  "duoshuo": "XXX"

}

[luckypoem]

hi.

我也出现一样错误：

as3:~/nico# nico build

       nico: 0.5.0
       load: nico.json

module.js:340
throw err;
^
Error: Cannot find module 'underscore'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (/root/nico/lib/writers/core.js:2:9)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
as3:~/nico#
如何解决？