[ovirt-users] ETL service aggregation to hourly tables has encountered an error. Please consult the service log for more details.

Dears, I have an a some error in Ovirt 4.2.7 In dash I see: ETL service aggregation to hourly tables has encountered an error. Please consult the service log for more details. In log ovirt engine server: 2019-01-14 15:59:59|rwL6AB|euUXph|wfcjQ7|OVIRT_ENGINE_DWH|HourlyTimeKeepingJob|Default|5|tWarn|tWarn_1|2019-01-14 15:59:59| ETL service aggregation to hourly tables has encountered an error. lastHourAgg value =Mon Jan 14 14:00:00 EET 2019 and runTime = Mon Jan 14 15:59:59 EET 2019 .Please consult the service log for more details.|42 In some sources people said the problem is in PostgreSQL DB, but I don't understand how can I fix this problem? Thanks