/accounts/refresh-token: 400 Bad Request

[ergauravsharma]

After downloading the source code and removing fakeBackendProvider and using
https://jasonwatmore.com/post/2020/05/13/node-mongo-api-with-email-sign-up-verification-authentication-forgot-password

for backend. I am getting following error

zone-evergreen.js:2845 POST http://localhost:4000/accounts/refresh-token 400 (Bad Request)
scheduleTask @ zone-evergreen.js:2845
scheduleTask @ zone-evergreen.js:385
onScheduleTask @ zone-evergreen.js:272
scheduleTask @ zone-evergreen.js:378
scheduleTask @ zone-evergreen.js:210
scheduleMacroTask @ zone-evergreen.js:233
scheduleMacroTaskWithCurrentZone @ zone-evergreen.js:1134
(anonymous) @ zone-evergreen.js:2878
proto. @ zone-evergreen.js:1449

Everything works fine, just when logout and login the app, I get this error continuously.

Could you please help me to understand why getting this error?

Thank you