TypeError: Cannot read property '0' of undefined

[kvz]

npm install -g transloadify@0.2.2

with steps.json being:

{
  "webp": {
    "use": ":original",
    "robot": "/image/resize",
    "result": true,
    "imagemagick_stack": "v2.0.3",
    "format": "webp"
  }
}

and the following command:

env \
  TRANSLOADIT_KEY=xx \
  TRANSLOADIT_SECRET=yy \
transloadify \
  --steps ./steps.json < assets/images/logo_milan_white_10.png > output.webp

I'm getting:

ERROR   TypeError: Cannot read property '0' of undefined
    at callback (../src/assemblies-create.js:430:25)
    at _fulfilled (/usr/local/lib/node_modules/transloadify/node_modules/q/q.js:834:54)
    at self.promiseDispatch.done (/usr/local/lib/node_modules/transloadify/node_modules/q/q.js:863:30)
    at Promise.promise.promiseDispatch (/usr/local/lib/node_modules/transloadify/node_modules/q/q.js:796:13)
    at /usr/local/lib/node_modules/transloadify/node_modules/q/q.js:604:44
    at runSingle (/usr/local/lib/node_modules/transloadify/node_modules/q/q.js:137:13)
    at flush (/usr/local/lib/node_modules/transloadify/node_modules/q/q.js:125:13)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

[kvz]

Hey @ifedapoolarewaju, assigning this to you, in case you feel like taking a look some time 😄 If not feel free to bounce back!