Debugger issue on Windows 7 (64bit)

I am unable to run the debugger on Windows 7(64bit). I am using Rails 2.3.9 and Ruby 1.8.7.

When ever I tried to run the debugger, I get the following error:

Cannot connect to the debugged process at port 51820 in 10s:

Dumping and destroying process, when the debuggee process is running. You might try to increase the timeout. Killing...

Error Output:
C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require': no such file to load -- require_relative (LoadError)
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
 from C:/Ruby187/lib/ruby/gems/1.8/gems/linecache-0.45/lib/linecache.rb:66
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `gem_original_require'
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `require'
 from C:/Ruby187/lib/ruby/gems/1.8/gems/ruby-debug-base-0.10.4/lib/ruby-debug-base.rb:3
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
 from C:/Ruby187/lib/ruby/gems/1.8/gems/ruby-debug-ide-0.4.17.beta5/lib/ruby-debug-ide.rb:5
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
 from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
 from C:/Ruby187/lib/ruby/gems/1.8/gems/ruby-debug-ide-0.4.17.beta5/bin/rdebug-ide:7
 from -e:1:in `load'
 from -e:1

Please try increasing timeout in Settings | Debugger | Ruby | Debug connection timeout