Facing problem while generating obj.getfeedToken()

[nayan_nandi]

This is my code_

from smartapi import SmartConnect
from smartapi import WebSocket
import creds

obj = SmartConnect(api_key=creds.api_key)
data = obj.generateSession(creds.client_token, creds.password)
feedToken = obj.getfeedToken()

print(feedToken)

when I trying to print feedToken it's shows None like this_

why it's happening....?