Build error with node v6

[chusiang]

I use gitbook build pdf and get error on node.js v6.

$ gitbook build pdf
(node:67256) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
(node:67256) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
info: loading book configuration....
warn: you should specify a gitbook version to use in your book.json, for example: 2.x.x
info: OK
info: >> 0 plugins loaded

Error: ENOENT: no such file or directory, lstat '/Users/jonny/vcs/mdr/design-doc/pdf'

node.js version.

$ node -v
v6.2.2

gitbook version.

$ gitbook -V
CLI version: 2.3.0
GitBook version: 2.0.1

[chusiang]

It's working with downgrade the node.js from v6 to v5 with n.

Refs.

• fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version. sequelize/cli#291
• tj/n: Node version management