-N NameError: global name 'w' is not defined

[inlineHamed]

When I am using -N I got this error and no output is generated:

[This is the debug log]

Connected: vnc-server:5901
feed: state=<bound method RFBNetworkClient.init_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='RFB 003.00'
protocol_version: 3.8
feed: state=<bound method RFBNetworkClient.auth7_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x02'
feed: state=<bound method RFBNetworkClient.auth7_2 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x02\x10'
server_securities: '\x02\x10'
feed: state=<bound method RFBNetworkClient.crauth_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x196R\xf8E\xad\xdf\x9e\xd4P'
challange: '\x196R\xf8E\xad\xdf\x9e\xd4P\xe2g\x195\x99*'
response: '\x8bj$VK\xc6\x15EE\xa5\x80\x99yB\x0c\x8d'
feed: state=<bound method RFBNetworkClient.crauth_2 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x00\x00\x00\x00'
server_result: 0
feed: state=<bound method RFBNetworkClient.start_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x084\x03\xe8 \x18\x00\x01\x00\xff'
feed: state=<bound method RFBNetworkClient.start_2 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data="root's X d"
Server Encoding:
width=2100, height=1000, name="root's X desktop (70c1da220863:1)"
pixelformat= (32, 24, 0, 1)
rgbmax= (255, 255, 255)
rgbshift= (16, 8, 0)
init_screen: 2100x1000, name="root's X desktop (70c1da220863:1)"
start: 0,0 (2100x1000)
set_screen_size: 2100x1000
FrameBufferUpdateRequest
feed: state=<bound method RFBNetworkClient.loop_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x00'
feed: state=<bound method RFBNetworkClient.frame_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x0c\x00\x03'
FrameBufferUpdate: nrects=3
feed: state=<bound method RFBNetworkClient.framerect_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\x00\x01\x00\x01\x00\n\x00\x10\xff\xff'
10 x 16 at (1,1), enc=-239
feed: state=<bound method RFBNetworkClient.richcursor_1 of <vnc2flv.rfb.RFBNetworkClient object at 0x7f966c29d650>>, data='\xff\xff\xff\x00\xff\xff\xff\x00\xff\xff'
RichCursor: 10x16 at 1,1
update(0): changes=2112 [(0, .....)]
write_video_frame: timestamp=0, data=57029
close
Traceback (most recent call last):
File "/usr/local/bin/flvrec.py", line 125, in
if name == "main": sys.exit(main(sys.argv))
File "/usr/local/bin/flvrec.py", line 123, in main
debug=debug, verbose=verbose)
File "/usr/local/bin/flvrec.py", line 51, in flvrec
client.idle()
File "/usr/local/lib/python2.7/dist-packages/vnc2flv/rfb.py", line 492, in idle
self.feed(data)
File "/usr/local/lib/python2.7/dist-packages/vnc2flv/rfb.py", line 107, in feed
(self._length, self._state) = self._state(x)
File "/usr/local/lib/python2.7/dist-packages/vnc2flv/rfb.py", line 411, in richcursor_1
mask = str2bitmap(mask, w, h, rowbytes)
NameError: global name 'w' is not defined