Getting Error: Script error. (:0) - How to resolve?

Current behavior:

Cypress test run fails on Chrome in before() with a cryptic error message:

Error: Script error. (:0)

Because this error occurred during a ‘before all’ hook we are skipping the remaining tests in the current suite: ‘Pets - Feed item’

Please see this screenshot:

Desired behavior:

A detailed error message should appear and should include clear instructions on how to resolve the problem.

Steps to reproduce: (app code and test code)

I’ve not been able to reproduce based on cypress-test-tiny repo so I’ve created a private repo containing a full test suite. I’ve sent emailed instructions on how to access it to [e-mail].

To reproduce using said repo, please:

1. Clone to Ubuntu.
2. Run npx cypress open.
3. Run this spec file: sanity/pets/feed_item.spec.js

Versions

Cypress v3.4.0 Ubuntu 16.04 LTS Chrome 75

[bahmutov]

The best workaround to see the source of error right now on the Guardian website for example is:

1. Look at the current error - keep DevTools open while the test is running

1. Set in cypress.json

{
  "chromeWebSecurity": false
}

Then rerun the test with DevTools open again and it should see better errors

1. Notice that the scripts throwing hundreds of errors come from domain assets.guim.co.uk so add it to the blacklists in cypress.json

{
  "chromeWebSecurity": false,
  "blacklistHosts": "assets.guim.co.uk"
}

1. This might reveal more errors coming from other locations.

1. Add the new source of errors to cypress.json

{
  "chromeWebSecurity": false,
  "blacklistHosts": ["assets.guim.co.uk", "interactive.guim.co.uk"]
}

and finally the site loads

[sebike88]

Having the same issue but i managed to find a workaround, in my case at least. Try setting "chromeWebSecurity": false in cypress.json. Before disabling web security i was getting Error: Script error. (:0), after disabling it cypress was logging the correct error.