the error reads:
The city does not exist and can not created from here.
if you open up the idempiere log (/opt/idempiere/log) you can see that there’s a problem with a duplicate c_location_id. it can be easily solved with an update query as shown below.
update ad_sequence set currentnext = ( ( select max(c_location_id)::int from c_location ) + 1) where ad_sequence_id = 60;