Cannot read property 'length' of undefined

[udayan28]

Steps to reproduce

In Bonus round: Single page apps, after set up the controller and routing, run bin/rake start

Expected behavior

display List of Ingredients page

Actual behavior

System configuration

Rails version:
6.0.2

Ruby version:
2.5.5

Node version:
12.16.1

yarn version:
1.19.1