Betty parse error betty/main.rb:126 [0.1.5]

[Ctesias]

I'm running linux 2.6.18-238.el5 with ruby 2.1.0:

$ uname -s
Linux
$ uname -r
2.6.18-238.el5

ruby -v
ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-linux]

my changelog says I'm at version 0.1.5 from May 13, I can't ask Betty anything because I get this parse error every time:

betty -v
/betty/main.rb:126: parse error
say += " -v '#{BettyConfig.get("voice")}'" if BettyConfig.get("voice")

[pannous]

commit f5de7e5
Date: Tue May 13 17:22:14 2014 +0200

say += " -v '#{voice}'" if voice