visio2pdf.rb:47:in `visio2pdf_exec': undefined method `Close' for nil:NilClass (NoMethodError)
from visio2pdf.rb:31:in `block in visio2pdf'
from visio2pdf.rb:29:in `each'
from visio2pdf.rb:29:in `visio2pdf'
from visio2pdf.rb:21:in `visio2pdf_controller'
from visio2pdf.rb:58:in `<main>'
Found this during execution: