How to ssl erpnext development enviorenment

how to setup the ssl to erpnext

below are the steps are performed

Go to your erpnext sites site_config.json

$ cd frappe-bench/sites/{{site_name}}
Add the following two lines to your site_config.json

“ssl_certificate”: “/etc/letsencrypt/live/”,
“ssl_certificate_key”: “/etc/letsencrypt/live/”

also unable to run
bench setup nginx
or bench clear cache

any one can help