ImportError: No module named ext.socketio

[chxin]

On Ubuntu 18.04, after I install instant-rst.py as README, I type 'instantRst' in shell, only got an error as fllowing:

~/.vim/bundle/InstantRst   master  instantRst
Traceback (most recent call last):
File "/usr/local/bin/instantRst", line 22, in
from instant_rst.server import run, shutdown_server
File "/usr/local/lib/python2.7/dist-packages/instant_rst/server.py", line 12, in
from flask.ext.socketio import SocketIO, emit
ImportError: No module named ext.socketio

I have already install flask, but cannot install flask.ext.socketio.

[bluefutureworld]

I use pip install Flask==0.10.1fixed this problem.
And also I found some problems when use Chrome browser but nice in Firefox.

[gu-fan]

oops, right. that's a specific version of flask