Undefined subroutine &Dancer::Plugin::Redis::plugin_args

[jbelloin]

When implementing the code found here
https://bitbucket.org/xtab/rer-web

I get this error on runtime:
[10298] error @1.173984> [hit #7]request to GET /json crashed: Undefined subroutine &Dancer::Plugin::Redis::plugin_args called at /usr/local/share/perl/5.14.2/Dancer/Plugin/Redis.pm line 26. in /usr/share/perl5/Dancer/Handler.pm l. 98

Do you have any clue what might cause it? I'm getting mad...

Thanks for your help