2.2.0 conda install fails with JSONDecodeError

In a freshly created py37 environment via conda-forge, I want to add nb_conda_kernels, but the install fails:

$ conda install nb_conda_kernels                                                                  (py37)
Collecting package metadata: done
Solving environment: done

## Package Plan ##

  environment location: /Users/klay6683/miniconda3/envs/py37

  added / updated specs:
    - nb_conda_kernels


The following NEW packages will be INSTALLED:

  bleach             conda-forge/noarch::bleach-3.1.0-py_0
  nb_conda_kernels   conda-forge/osx-64::nb_conda_kernels-2.2.0-py37_1000


Proceed ([y]/n)?

Preparing transaction: done
Verifying transaction: done
Executing transaction: / + /Users/klay6683/miniconda3/envs/py37/bin/python -m nb_conda_kernels.install --enable
Enabling nb_conda_kernels...
Traceback (most recent call last):
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/nb_conda_kernels/install.py", line 190, in <module>
    exit(install(**parser.parse_args().__dict__))
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/nb_conda_kernels/install.py", line 159, in install
    cfg_g = BaseJSONConfigManager(config_dir=path_g).get(JNC)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/traitlets/config/manager.py", line 63, in get
    return json.load(f)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/__init__.py", line 296, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 9 column 5 (char 196)

failed
ERROR conda.core.link:_execute(543): An error occurred while installing package 'conda-forge::nb_conda_kernels-2.2.0-py37_1000'.
LinkError: post-link script failed for package conda-forge::nb_conda_kernels-2.2.0-py37_1000
running your command again with `-v` will provide additional information
location of failed script: /Users/klay6683/miniconda3/envs/py37/bin/.nb_conda_kernels-post-link.sh
==> script messages <==
+ /Users/klay6683/miniconda3/envs/py37/bin/python -m nb_conda_kernels.install --enable
Enabling nb_conda_kernels...
Traceback (most recent call last):
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/nb_conda_kernels/install.py", line 190, in <module>
    exit(install(**parser.parse_args().__dict__))
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/nb_conda_kernels/install.py", line 159, in install
    cfg_g = BaseJSONConfigManager(config_dir=path_g).get(JNC)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/traitlets/config/manager.py", line 63, in get
    return json.load(f)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/__init__.py", line 296, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 9 column 5 (char 196)


Attempting to roll back.

Rolling back transaction: done

LinkError: post-link script failed for package conda-forge::nb_conda_kernels-2.2.0-py37_1000
running your command again with `-v` will provide additional information
location of failed script: /Users/klay6683/miniconda3/envs/py37/bin/.nb_conda_kernels-post-link.sh
==> script messages <==
+ /Users/klay6683/miniconda3/envs/py37/bin/python -m nb_conda_kernels.install --enable
Enabling nb_conda_kernels...
Traceback (most recent call last):
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/nb_conda_kernels/install.py", line 190, in <module>
    exit(install(**parser.parse_args().__dict__))
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/nb_conda_kernels/install.py", line 159, in install
    cfg_g = BaseJSONConfigManager(config_dir=path_g).get(JNC)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/site-packages/traitlets/config/manager.py", line 63, in get
    return json.load(f)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/__init__.py", line 296, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/klay6683/miniconda3/envs/py37/lib/python3.7/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 9 column 5 (char 196)

Some system info: conda info

     active environment : py37
    active env location : /Users/klay6683/miniconda3/envs/py37
            shell level : 1
       user config file : /Users/klay6683/.condarc
 populated config files : /Users/klay6683/.condarc
                          /Users/klay6683/miniconda3/envs/py37/.condarc
          conda version : 4.6.1
    conda-build version : not installed
         python version : 3.7.2.final.0
       base environment : /Users/klay6683/miniconda3  (writable)
           channel URLs : https://conda.anaconda.org/conda-forge/osx-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/osx-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/free/osx-64
                          https://repo.anaconda.com/pkgs/free/noarch
                          https://repo.anaconda.com/pkgs/r/osx-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /Users/klay6683/miniconda3/pkgs
                          /Users/klay6683/.conda/pkgs
       envs directories : /Users/klay6683/miniconda3/envs
                          /Users/klay6683/.conda/envs
               platform : osx-64
             user-agent : conda/4.6.1 requests/2.21.0 CPython/3.7.2 Darwin/18.2.0 OSX/10.14.3
                UID:GID : 273771:2260
             netrc file : None
           offline mode : False

conda config --show-sources

==> /Users/klay6683/.condarc <==
auto_update_conda: True
pinned_packages: []
report_errors: True
anaconda_upload: True

==> /Users/klay6683/miniconda3/envs/py37/.condarc <==
pinned_packages:
  - conda-forge::opencv
  - conda-forge::gdal
  - conda-forge::numpy
channels:
  - conda-forge
  - defaults

[michaelaye]

installing 2.1.1 works fine.

[mcg1969]

I’m going to need some help reproducing this.

conda create -n p37 -c conda-forge python=3.7 notebook
conda install -n p37 -c conda-forge nb_conda_kernels

Produces the following output:

Collecting package metadata (current_repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: /Users/mgrant/miniconda3/envs/p37

  added / updated specs:
    - nb_conda_kernels


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    nb_conda_kernels-2.2.3     |           py37_0          32 KB  conda-forge
    ------------------------------------------------------------
                                           Total:          32 KB

The following NEW packages will be INSTALLED:

  nb_conda_kernels   conda-forge/osx-64::nb_conda_kernels-2.2.3-py37_0


Proceed ([y]/n)? y


Downloading and Extracting Packages
nb_conda_kernels-2.2 | 32 KB     | ##################################### | 100% 
Preparing transaction: done
Verifying transaction: done
Executing transaction: \ b'Enabling nb_conda_kernels...\nStatus: enabled\n'
done

What’s different about my installation vs. yours, I wonder?