could anyone help me with this?

You should look at the log file from your run that actually contains the error (in your case it appears to be

10-opendp.log

in the

logs/placement

folder) since the error you have here is I think only telling you that an error has occurred, the step it occurred at, and where the actual error log is located.

detailed placement not happening properly. Overlaps coz of less core area or congestion is high. Re-floorplan and try. if error comes raise GitHub issue with source RTL file