PdfConverter jrubyfx issue

gistfile1.txt

Fast Debugger (ruby-debug-ide 0.4.18, ruby-debug-base 0.10.5.rc5) listens on 127.0.0.1:50966
2013-08-01 14:40:58.151 java[1706:2517] Invalid URL passed to an open/save panel: ''.  Using 'file://localhost/Volumes/LaCie/' instead.
Glass detected outstanding Java exception at -[GlassViewDelegate sendJavaMouseEvent:]:src/com/sun/mat/ui/GlassViewDelegate.m:541
Exception in thread "JavaFX Application Thread" org.jruby.exceptions.RaiseException: (RuntimeError) Java wrapper with no contents: ProgressAlert
  at RUBY.print_variable(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/xml_printer.rb:171)
	at RUBY.print_variable((eval):5)
	at RUBY.mon_synchronize(/Users/charles/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/monitor.rb:211)
	at RUBY.print_variable((eval):3)
	at RUBY.print_variables(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/xml_printer.rb:103)
	at org.jruby.RubyArray.each(org/jruby/RubyArray.java:1617)
	at RUBY.print_variables(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/xml_printer.rb:102)
	at RUBY.print_element(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/xml_printer.rb:303)
	at RUBY.print_element((eval):5)
	at RUBY.mon_synchronize(/Users/charles/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/monitor.rb:211)
	at RUBY.print_element((eval):3)
	at RUBY.print_variables(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/xml_printer.rb:99)
	at RUBY.print_variables((eval):5)
	at RUBY.mon_synchronize(/Users/charles/.rvm/rubies/jruby-1.7.4/lib/ruby/1.9/monitor.rb:211)
	at RUBY.print_variables((eval):3)
	at org.jruby.RubyBasicObject.__send__(org/jruby/RubyBasicObject.java:1715)
	at org.jruby.RubyKernel.send(org/jruby/RubyKernel.java:2217)
	at RUBY.method_missing(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/command.rb:80)
	at RUBY.execute(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/commands/variables.rb:132)
	at RUBY.process_commands(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/ide_processor.rb:41)
	at org.jruby.RubyArray.each(org/jruby/RubyArray.java:1617)
	at RUBY.process_commands(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/ide_processor.rb:34)
	at org.jruby.RubyKernel.catch(org/jruby/RubyKernel.java:1254)
	at RUBY.process_commands(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/ide_processor.rb:33)
	at RUBY.line_event(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/event_processor.rb:58)
	at RUBY.at_line(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-ide-0.4.18/lib/ruby-debug-ide/event_processor.rb:34)
	at RUBY.at_line(/Users/charles/.rvm/gems/jruby-1.7.4/gems/ruby-debug-base-0.10.5.rc5-java/lib/ruby-debug-base.rb:54)
	at RUBY.previewPDF(/Users/charles/RubymineProjects/PdfConverter/src/pdf_converter.rb:58)
	at org.jruby.RubyProc.call(org/jruby/RubyProc.java:274)
	at org.jruby.RubyBasicObject.__send__(org/jruby/RubyBasicObject.java:1709)
	at org.jruby.RubyKernel.send(org/jruby/RubyKernel.java:2213)
	at RUBY.handle(/Users/charles/.rvm/gems/jruby-1.7.4/gems/jrubyfx-fxmlloader-0.2-java/lib/fxmlloader/elts.rb:558)
	at EventHandlerWrapper_959451928.handle(EventHandlerWrapper_959451928.gen:13)