What does this error mean in Power bi?

I have an ODBC connection and a Postgre connection(Direct Query) in my model. I have a slicer on timestamp coming from Postgre connection and another slicer of Ids from ODBC connection and I have a line chart where I have timestamp in one axis and values on Y axis (both from ODBC table) and Legend are Ids from Postgre Sql db. Everything works fine and I can see my line chart without any issue, but if I select more than 4 ids in slicer I get below error. What does this mean?? and how can I avoid it. Even in time lsicer I select 1 day and select more than 4 ids I  still get same error.

Error received:

I have a  OLE DB or ODBC error: PostgreSQL:42000 Total limit on amount of aggregated datapoints exceeded