Grafana Login issue with admin creds

Hi All,

I have used Grafana with admin creds over a month and suddenly one day it stopped working and not able to login with admin creds. I tried all possible ways suggested in community to reset the password using grafana-cli and updating sqlite db for user=admin, but nothing worked out.
So i took a backup of current configuration and I re-installed the Grafana again but still i am getting the same error.

lvl=eror msg=“Anonymous access organization error.” logger=context org_name=“TUI Anonymous” error=“organization not found”
lvl=eror msg=“Invalid username or password” logger=context userId=0 orgId=0 uname= error=“invalid username or password” by me)
Any help is much appreciated. I am using grafana-8.3.7 version.