Ruby on Rails

good day i read about relativity gem but when i try to use it and make
a test file and build it gives me an error

=test.rb=
<pre>

require 'relativity'
opens_at = DayTime.new(9) #=> 09:00:00
closes_at = DayTime.new(12,30) #=> 12:30:00
</pre>

<pre>
/home/start/.rvm/gems/ruby-1.9.2-p290/gems/relativity-0.0.8/lib/
relativity/day_time/new.rb:24:in `BigDecimal': can't convert Fixnum
into String (TypeError)
from /home/start/.rvm/gems/ruby-1.9.2-p290/gems/relativity-0.0.8/lib/
relativity/day_time/new.rb:24:in `initialize'
from /home/start/Aptana Studio 3 Workspace/jquery/javascript/test.rb:
2:in `new'
from /home/start/Aptana Studio 3 Workspace/jquery/javascript/test.rb:
2:in `<main>'
</pre>

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