Deploy not working from Lektor Admin on Python 3.6

I’m trying to deploy Lektor from the admin interface running on Python 3.6. I get the following error in the terminal:

Started build
Error on request:
Traceback (most recent call last):
  File "/private/tmp/test/lib/python3.6/site-packages/werkzeug/serving.py", line 270, in run_wsgi
    execute(self.server.app)
  File "/private/tmp/test/lib/python3.6/site-packages/werkzeug/serving.py", line 261, in execute
    write(data)
  File "/private/tmp/test/lib/python3.6/site-packages/werkzeug/serving.py", line 241, in write
    assert isinstance(data, bytes), 'applications must write bytes'
AssertionError: applications must write bytes
Finished build in 0.02 sec

These are the steps to reproduce:

$ virtualenv -p python3.6 test
$ cd test/
$ source bin/activate
$ pip install lektor
$ lektor quickstart  # answer all with "test" and Yes
$ cd test

# add the following to test.lektorproject
[servers.ghpages]
name = GHPages
enabled = yes
target = ghpages://test/test

$ lektor server

# go to http://localhost:5000/admin/root/edit
# click Deploy icon
# observe error above in the terminal

I tried other deploy options as well and I get the same error.

What else can I try? What additional information can I provide to make this easier to debug?

[nixjdm]

@msom Here you go! https://github.com/lektor/lektor/releases/tag/3.1.2

[nixjdm]

Yes, this is definitely release worthy. Give me a couple days and I’ll have one out. 😃