developer_mode error

ERPNext
1

i have two sites one is http://localhost/ default site and another one is http://localhost:82/ here first site only we can do developer mode applied not applied in second one

2

What is the error?
for developer mode setting please see
https://kb.frappe.io/kb/app-development/how-enable-developer-mode-in-frappe

3

You will have to setup developer mode in both sites