node.js - 利用SVN的Hooks:post-commit更新Gitbook 报错怎么解决？

在svn/hooks/post-commit

#!/bin/sh

SVN=/usr/bin/svn
GITBOOK=/usr/bin/gitbook
cd /data/gitbook_svn
$SVN update
$GITBOOK build

上面的意思是：在svn提交代码时，更新/data/gitbook_svn的代码，并执行gitbook build 生成Gitbook 文档。
直接执行命令sudo sh post-commit是可以更新wiki的，但是如果从svn提交，就会报错，有遇到过的吗？

Xiaoyi:gitbook Ricky$ sudo svn ci 上传语音.md  -m"ci"
Sending        上传语音.md
Transmitting file data .
Committed revision 260.

Warning: post-commit hook failed (exit code 8) with output:

path.js:313
        throw new TypeError('Arguments to path.resolve must be strings');
              ^
TypeError: Arguments to path.resolve must be strings
    at Object.exports.resolve (path.js:313:15)
    at Object. (/usr/lib/node_modules/gitbook-cli/lib/config.js:5:24)
    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)
    at require (module.js:380:17)
    at Object. (/usr/lib/node_modules/gitbook-cli/bin/gitbook.js:11:14)
    at Module._compile (module.js:456:26)

Node.js 我不太懂，还请高手指点下！