Metrics/data dashboard are not displayed

[worldy]

When I am logged in, the metrics/data are not displayed. I get the following error message: Invalid params. Login name or password is incorrect.

When I look at the Grafana logs, I see:

1. zabbix authentication error logger=plugins.backend pluginS=alexanderzobnin-zabbix-datasource error ="Invalid params. Login name or password is incorrect."
2. "Request Completed" logger=context userId=1 orgId=2 uname=admin method=GET path=/api/datasource/proxy/2/search/computer status=206 remote_addr=x.x.x.x time_ms=215 size=6013 referer="http://x.x.x.x...

PS: since yesterday it has always worked normally.