NoneType error when open Ruby on Rails project

[bachue]

Hi,

I found this NoneType error in my log, not sure if there's any impact. Could you take a look?

=> => => Console logging activated (/Users/zhour6/.subl.log). Timestamp: 27 Nov 2013, 11:20:22.
SublimeLinter: ruby enabled (using "ruby" for executable)
SublimeLinter: css enabled (using node.js)
ApplySyntax: Syntax set to Ruby on Rails using Packages/Rails/Ruby on Rails.tmLanguage
Traceback (most recent call last):
  File "./SublimeBlockCursor.py", line 43, in on_command_mode_change
  File "./SublimeBlockCursor.py", line 22, in on_selection_modified
AttributeError: 'NoneType' object has no attribute 'settings'
ex_command(name=':', command='ex_goto', forced=False, args={}, parse_errors=[], line_range={'right_ref': None, 'left_offset': 1704, 'text_range': u'1704', 'right_offset': None, 'left_ref': None, 'left_search_offsets': [], 'separator': None, 'right_search_offsets': []}, can_have_range=True)

Thanks!