PyYAML not found

I have problem with RedNotebook.
My system is Archlinux, I downloaded RedNotebook source version, and when i trying execyte "./run" command, I getting this message:

2013-11-27 14:06:21,461 DEBUG Debug message
2013-11-27 14:06:21,461 INFO Writing log to file "/home/endriu/.rednotebook/rednotebook.log"
2013-11-27 14:06:21,461 INFO System encoding: UTF-8
2013-11-27 14:06:21,461 INFO Language code: en_US
2013-11-27 14:06:21,474 INFO MathJax location: http://cdn.mathjax.org/mathjax/latest/MathJax.js
2013-11-27 14:06:21,475 ERROR PyYAML not found. Please install python-yaml or PyYAML

I have installed python-yaml

[endriu@gethiox-laptop rednotebook-1.7.3]$ pacman -Ss python-yaml
community/python-yaml 3.10-3 [installed]

What may be wrong? I need create symlinks?