LOGBOOK #136 RotatingFileHandler gives ValueError: I/O operation on closed file

OS.config

Windows 7 x64

output.log

WE NEED TO FILL UP THE FILE
WITH 100 BYTES OF STUFF
SO THAT WHEN LOGBOOK TRIES TO RUN
IT NEEDS TO ROTATE THE FILE
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce consequat, ipsum at interdum congue, eros sapien sodales mi, at iaculis eros mauris sit amet nulla. Aliquam ultricies vehicula consectetur. Curabitur in eleifend eros, ut dictum elit. In metus mauris, convallis sit amet ullamcorper in, eleifend ultrices eros. Pellentesque vitae metus libero. In a rhoncus ligula. Nulla euismod suscipit augue, a rhoncus nunc tempor id. Donec dictum est at lobortis aliquam. Pellentesque nibh felis, aliquet vitae nulla ac, convallis eleifend nulla. Phasellus ut dignissim mi. Mauris auctor orci eget lorem interdum fermentum. Suspendisse tristique tortor nec nulla congue, id ullamcorper nibh fringilla. Nulla tempor massa non quam tempus consequat. Quisque sit amet metus tortor.

output.txt

[py3] D:\Veaviticus\github\logbook_error>python run.py
 * Running on http://0.0.0.0:5001/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 940-711-594
Traceback (most recent call last):
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\handlers.py", line 212, in handle
    self.emit(record)
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\handlers.py", line 761, in emit
    self.perform_rollover()
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\handlers.py", line 752, in perform_rollover
    rename(self._filename, self._filename + '.1')
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\helpers.py", line 167, in rename
    os.rename(src, dst)
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'output.log' -> 'output.log.1'
Logged from file D:\Veaviticus\github\logbook_error\run.py, line 16
127.0.0.1 - - [15/Feb/2016 14:02:09] "GET /index HTTP/1.1" 200 -
127.0.0.1 - - [15/Feb/2016 14:02:09] "GET /favicon.ico HTTP/1.1" 404 -
Traceback (most recent call last):
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\handlers.py", line 212, in handle
    self.emit(record)
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\handlers.py", line 760, in emit
    if self.should_rollover(record, len(msg)):
  File "C:\Miniconda3\envs\py3\lib\site-packages\logbook\handlers.py", line 738, in should_rollover
    self.stream.seek(0, 2)
ValueError: I/O operation on closed file.
Logged from file D:\Veaviticus\github\logbook_error\run.py, line 16
127.0.0.1 - - [15/Feb/2016 14:02:11] "GET /index HTTP/1.1" 200 -

requirements.txt

Flask==0.10.1
Logbook==0.12.5

run.py

import flask
import logbook

handler = logbook.RotatingFileHandler("output.log", level="DEBUG", max_size=100)
handler.format_string = '[{record.time}] [{record.level_name}] [{record.channel}] {record.message}'

handler.push_application()

app = flask.Flask(__name__)

LOGGER = logbook.Logger('Routes')

@app.route('/')
@app.route('/index', methods=['GET'])
def main():
	LOGGER.debug("FOO")
	return "HELLO WORLD"

app.run(
	debug=True,
	host= '0.0.0.0',
	port=5001
)