[whackage] Package my-library is not a registered dependency in my-app

Hello! I'm trying repeat it:
https://formidable.com/blog/2016/12/01/introducing-whackage/

$ whack link ../../my-library
here is error:
[whackage] Package my-library is not a registered dependency in my-app

After added in dependency I have new error:

`events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: spawn npm ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:229:19)
    at onErrorNT (internal/child_process.js:406:16)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
    at startup (internal/bootstrap/node.js:266:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:596:3)
Emitted 'error' event at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:235:12)
    at onErrorNT (internal/child_process.js:406:16)
    [... lines matching original stack trace ...]
    at bootstrapNodeJSCore (internal/bootstrap/node.js:596:3)`

node - v10.7.0
npm - 6.1.0

[rammoozz]

I ran into the same issue, ended up manually adding it in whackage.json

 "react-native-generic-text": "../react-native-component-boilerplate-master"