Error when Enable "developer_mode": 1

Continuing the discussion from Create New Doctype With JSON:

But when I Set "developer_mode": 1 in your site_config.json. I can’t run frappe. i can’t run “bench start” . i have a Error . Help me !Continuing the discussion from Error when config “developer_mode”: 1:

[quote=“JackLe, post:1, topic:3592, full:true”]
I have a error. When i set up “develop_mode”

To create models, you must set developer_mode as 1 in the site_config.json file.
“db_name”: “library”,
“db_password”: “v3qHDeVKvWVi7s97”,
“developer_mode”: 1

but I have a error.
i can’t start or restart bench .