Cannot login to erpnext first time

Had installed a fresh copy of erpnext in my server.
when try to login using administrator credentials for first time nothing happens. its just not logging in.

when i check the consoles of browser it shows:

POST 404 (NOT FOUND) - jquery.min.js:4
Uncaught SyntaxError: Unexpected token < in JSON at position 0
    at JSON.parse (<anonymous>)
    at Object.<anonymous> (
    at i (
    at Object.fireWith [as rejectWith] (
    at z (
    at XMLHttpRequest.<anonymous> (

What could be the problem pls help me,

start setup with bench start instead of bench serve --port command

i want it to be served to 9090 port

there’s something wrong with your router / modem /switch - > do not connect directly or just reset it, that’s what i DID