Illustrator script: apply swatch from library

Hi,

I'm working on a script to apply a swatch from a library to a pathItem and the color name to a textFrame.

It works, the problem is it crashes when I close the file with the PMS Library. Any help would be very appreciated.

Here is my code.

#target Illustrator
var docRef = app.activeDocument;
var docRef1 = app.open(File("~/Documents/PMSLibrary.ai"));
  // Get specific swatch
  var PMSColor = docRef1.swatches.getByName('PANTONE 100 C');
  // Add Swatch to Original Document
  var AddColor = docRef.swatches.add();
  AddColor.name = PMSColor.name;
  AddColor.color = PMSColor.color
  // Add text frame and pathItem
  var ColorFrame = docRef.textFrames.add('Color')
  var ColorBox = docRef.pathItems.add('Box')
  // Assign to Text Frame
  ColorFrame.contents = PMSColor.name
  // Assign color to PathItem
  ColorBox.fillColor = PMSColor.color
  // Close reference document
  docRef1.close(SaveOptions.DONOTSAVECHANGES);
  app.redraw();;

Thanks!