Can't spawn the start-storybook process

Hi,

I have come accross this issue where I am unable to use the serverCmd flag to start a storybook. Please see the outout below:

> storycap --serverCmd "start-storybook -p 9001" http://localhost:9001/

info Wait for connecting storybook server http://localhost:9001/.
events.js:187
      throw er; // Unhandled 'error' event
      ^

Error: spawn start-storybook ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:264:19)
    at onErrorNT (internal/child_process.js:456:16)
    at processTicksAndRejections (internal/process/task_queues.js:80:21)
Emitted 'error' event on ChildProcess instance at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:270:12)
    at onErrorNT (internal/child_process.js:456:16)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  errno: 'ENOENT',
  code: 'ENOENT',
  syscall: 'spawn start-storybook',
  path: 'start-storybook',
  spawnargs: [ '-p', '9001' ]
}

Let me know if you need more info. Thank you 😄