pyvenv-workon fails with json-readtable-error 112

[mhlinder]

I am using pyvenv-workon and encountering a json-read error:

Debugger entered--Lisp error: (json-readtable-error 112)
  signal(json-readtable-error (112))
  json-read()
  pyvenv-run-virtualenvwrapper-hook("pre_activate" nil "/Users/henry/.pyenv/versions/science/")
  pyvenv-activate("/Users/henry/.pyenv/versions/science/")```

I cannot find documentation or figure out myself what this 112 error code means. This sounds somewhat like #117 , but reinstalling did not work.

Is there any way I can get better debug information -- for example, what JSON is being read?