DRD error message meaning

Hi,

I am trying to make the gnd rails at the bottom of the PR boundary, When I was trying to make a metal 1 line for the gnd rail, the DRD tool points out 2 messages: "minPRBoundaryInteriorHalo 0" and "Off-Screen minPRBoundaryInteriorHalo 0" (please see the image below). After I make this rail, there is a permanent error highlighted (last image). I don't understand these terms. Please help what I am doing wrong here?

Thanks and regards,

Vishesh