--- a/editors/TextViewer.py	Thu Oct 04 11:25:42 2018 +0300
+++ b/editors/TextViewer.py	Thu Oct 04 12:07:16 2018 +0300
@@ -29,6 +29,7 @@
 
 import wx
 import wx.stc
+from six.moves import xrange
 
 from graphics.GraphicCommons import ERROR_HIGHLIGHT, SEARCH_RESULT_HIGHLIGHT, REFRESH_HIGHLIGHT_PERIOD
 from plcopen.structures import ST_BLOCK_START_KEYWORDS, IEC_BLOCK_START_KEYWORDS, LOCATIONDATATYPES