Issues with the "PHP Laravel Starter Bundle"

I'm having a few issues with the PHP Laravel Starter Bundle

1. When i'm trying to edit a user while having admin permissions i get the following error and data is not loaded into the fields:
`ERROR TypeError: Cannot read property 'toString' of undefined`
Visited url: http://website.be/pages/users/edit/1

2. Error when trying to add user:
`POST https://website.be/admin/backend/public/api/users 422 (Unprocessable Entity)`
Visited url: http://website.be/pages/users/add

3. Where is the user list? there is supposed to be "Basic User Management"

Thanks in advance!