Traceback (most recent call last):

 "/home/pi/oprint/local/lib/python2.7/site-packages/sockjs_tornado-1.0.1-py2.7.egg/sockjs/tornado/periodic.py", line 69, in _run
next_call = self.callback()

 "/home/pi/oprint/local/lib/python2.7/site-packages/sockjs_tornado-1.0.1-py2.7.egg/sockjs/tornado/session.py", line 409, in _heartbeat
self.handler.send_pack(proto.HEARTBEAT)

 "/home/pi/oprint/local/lib/python2.7/site-packages/sockjs_tornado-1.0.1-py2.7.egg/sockjs/tornado/transports/websocket.py", line 86, in send_pack
self.write_message(message, binary)

 "/home/pi/oprint/local/lib/python2.7/site-packages/tornado-4.0.1-py2.7-linux-armv7l.egg/tornado/websocket.py", line 201, in write_message
self.ws_connection.write_message(message, binary=binary)

 "/home/pi/oprint/local/lib/python2.7/site-packages/tornado-4.0.1-py2.7-linux-armv7l.egg/tornado/websocket.py", line 491, in write_message
self._write_frame(True, opcode, message)

 "/home/pi/oprint/local/lib/python2.7/site-packages/tornado-4.0.1-py2.7-linux-armv7l.egg/tornado/websocket.py", line 480, in _write_frame
self.stream.write(frame)

 "/home/pi/oprint/local/lib/python2.7/site-packages/tornado-4.0.1-py2.7-linux-armv7l.egg/tornado/iostream.py", line 348, in write
self._handle_write()

 "/home/pi/oprint/local/lib/python2.7/site-packages/tornado-4.0.1-py2.7-linux-armv7l.egg/tornado/iostream.py", line 801, in _handle_write
self._write_buffer.popleft()IndexError: pop from an empty deque
Traceback (most recent call last):


 "import_class.py", line 1, in <module>

from doesntexist import SomeClass
ImportError: No module named 'doesntexist'
