pgAdmin3 restore data only - Mailing list pgadmin-support

I have a development pg and a server pg.  I would like to copy the data from production to development (and replace any data that is already in development).  I ran a custom format backup using pgAdmin3 on production.  I'm now trying to restore that backup to development.  I checked the data-only option. But, I get the following errors:  pg_restore: [archiver (db)] COPY failed for table "actcodes": ERROR:  duplicate key value violates unique constraint "actcodes_pkey"