=== modified file 'share/extensions/webslicer_export.py'
--- share/extensions/webslicer_export.py	2016-05-26 09:28:23 +0000
+++ share/extensions/webslicer_export.py	2017-02-14 05:43:16 +0000
@@ -166,7 +166,7 @@
 
 
     def create_the_temporary_svg(self):
-        (ref, self.tmp_svg) = tempfile.mkstemp('.svg')
+        (self.tmp_svg_ref, self.tmp_svg) = tempfile.mkstemp('.svg')
         layer = self.get_slicer_layer()
         current_style = ('style' in layer.attrib) and layer.attrib['style'] or ''
         layer.attrib['style'] = 'display:none'
@@ -175,6 +175,7 @@
 
 
     def delete_the_temporary_svg(self):
+        os.close( self.tmp_svg_ref)
         os.remove( self.tmp_svg )