Reading XML in Ruby on linux

I am working on RHEL 5. I have to build a web automation framwork using Ruby. when I am trying to read a XML file using Chilkat ruby I am getting following error.

Ruby code where I am getting the error.

require ‘rubygems’
require ‘Chilkat’

xml =
@strContent =
@strTag =
@strXml =
@processNode = xml.SearchForTag(nil,“t:test_case”)

While running the code I am getting this message –

/root/Desktop/readxml.rb:14:in LoadXmlFile': Expected argument 0 of type CkXml *, but got Chilkat::CkXml #<Chilkat::CkXml:0x000000038e3... (TypeError) in SWIG method 'LoadXmlFile' from /root/Desktop/readxml.rb:14:in <main>’

Please help me in resolving the error.