Reading JSON mysteriously fails

[mtbc]

$ omero render info 5251 --style=yaml >/tmp/foo.yaml
Using session for user-3@localhost:4064. Idle timeout: 10 min. Current group: read-only-1
$ omero render set Image:5251 /tmp/foo.yaml 
Using session for user-3@localhost:4064. Idle timeout: 10 min. Current group: read-only-1
/tmp/omero/lib/python3.5/site-packages/omero/util/pydict_text_io.py:81: YAMLLoadWarning: calling yaml.load_all() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  data = list(yaml.load_all(rawdata))
$ omero render info 5251 --style=json >/tmp/foo.json
Using session for user-3@localhost:4064. Idle timeout: 10 min. Current group: read-only-1
$ omero render set Image:5251 /tmp/foo.json
Using session for user-3@localhost:4064. Idle timeout: 10 min. Current group: read-only-1
Could not read /tmp/foo.json
$ 

[sbesson]

I failed to reproduce locally

[sbesson@ome-demoserver ~]$  venv/bin/omero render info 120100 --style=yaml > /tmp/foo.yml
Using session for sbesson@localhost:4064. Idle timeout: 10 min. Current group: 2018-11
[sbesson@ome-demoserver ~]$ venv/bin/omero render set Image:120100 /tmp/foo.yml 
Using session for sbesson@localhost:4064. Idle timeout: 10 min. Current group: 2018-11
/fc/homes/sbesson/venv/lib64/python3.6/site-packages/omero/util/pydict_text_io.py:81: YAMLLoadWarning: calling yaml.load_all() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
  data = list(yaml.load_all(rawdata))
[sbesson@ome-demoserver ~]$ venv/bin/omero render info 120100 --style=json > /tmp/foo.json
Using session for sbesson@localhost:4064. Idle timeout: 10 min. Current group: 2018-11
[sbesson@ome-demoserver ~]$ venv/bin/omero render set Image:120100 /tmp/foo.json
Using session for sbesson@localhost:4064. Idle timeout: 10 min. Current group: 2018-11

My environment is as follows:

[sbesson@ome-demoserver ~]$ venv/bin/pip freeze
future==0.18.2
numpy==1.18.4
omero-cli-render==0.5.0
omero-py==5.6.2
Pillow==7.1.2
PyYAML==5.3.1
zeroc-ice==3.6.5

Can you give the output of the following command which should log the underlying exception at the DEBUG level?

omero --debug=DEBUG render set Image:5251 /tmp/foo.json

[mtbc]

$ omero --debug=DEBUG render set Image:5251 /tmp/foo.json
Using session for user-3@localhost:4064. Idle timeout: 10 min. Current group: read-only-1
Error printing text
the JSON object must be str, not 'bytes'
Traceback (most recent call last):
  File "/tmp/omero/lib/python3.5/site-packages/omero_cli_render.py", line 590, in _load_rendering_settings
    data = pydict_text_io.load(source, session=session)
  File "/tmp/omero/lib/python3.5/site-packages/omero/util/pydict_text_io.py", line 91, in load
    data = json.loads(rawdata)
  File "/usr/lib/python3.5/json/__init__.py", line 312, in loads
    s.__class__.__name__))
TypeError: the JSON object must be str, not 'bytes'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/omero/lib/python3.5/site-packages/omero/cli.py", line 523, in safePrint
    stream.write(text)
TypeError: write() argument must be str, not TypeError
Could not read /tmp/foo.json
$ pip freeze
attrs==19.3.0
certifi==2020.4.5.1
chardet==3.0.4
Deprecated==1.2.9
Django==1.11.29
django-pipeline==1.6.14
flake8==2.4.0
future==0.18.2
gunicorn==20.0.4
idna==2.9
importlib-metadata==1.6.0
mccabe==0.3.1
more-itertools==8.2.0
numexpr==2.7.1
numpy==1.18.4
omero-cli-render==0.5.0
omero-marshal==0.7.0
omero-py==5.6.2
omero-web==5.6.3
packaging==20.3
pathlib2==2.3.5
pep8==1.5.7
Pillow==7.1.2
pkg-resources==0.0.0
pluggy==0.13.1
py==1.8.1
pyflakes==0.8.1
PyGithub==1.51
PyJWT==1.7.1
pyparsing==2.4.7
pytest==5.4.2
pytz==2020.1
PyYAML==5.3.1
requests==2.23.0
scc==0.12.8
six==1.14.0
tables==3.6.1
urllib3==1.25.9
wcwidth==0.1.9
websocket-client==0.57.0
wrapt==1.12.1
yaclifw==0.2.0
zeroc-ice==3.6.5
zipp==1.2.0
$

[mtbc]

Thank you, I shall certainly have to remember that DEBUG trick.