Eclipse NativeException on OS X

[rmsy]

Redcar 0.13 ( java )
***WARNING: Display must be created on main thread due to Cocoa restrictions.
NativeException: org.eclipse.swt.SWTException: Invalid thread access
               display at /Users/Isaac/.rvm/gems/ruby-2.0.0-p353/gems/swt-0.18/lib/swt/minimal.rb:82
                  show at /Users/Isaac/.rvm/gems/ruby-2.0.0-p353/gems/redcar-0.13/plugins/splash_screen/splash_screen.rb:20
  create_splash_screen at /Users/Isaac/.rvm/gems/ruby-2.0.0-p353/gems/redcar-0.13/plugins/splash_screen/splash_screen.rb:9
           show_splash at /Users/Isaac/.rvm/gems/ruby-2.0.0-p353/gems/redcar-0.13/lib/redcar.rb:208
                (root) at /Users/Isaac/.rvm/gems/ruby-2.0.0-p353/gems/redcar-0.13/bin/redcar:29

I get this error when attempting to launch Redcar on OS X (Mavericks).