[Tile-serving] [openstreetmap/osm2pgsql] Command osm2pgsql --append --slim gives ERROR: duplicate key value violates unique constraint "planet_osm_rels_pkey" (#769)

[LXSysadmin]

I have used manual https://switch2osm.org/serving-tiles/building-a-tile-server-from-packages/ for Ubuntu 14.04 and have imported ¨europe-latest.osm.pbf¨ with command osm2pgsql --slim -C 24500 --number-processes 8 europe-latest.osm.pbf. Now i want to add USA map, i have downloaded ¨south-america-latest.osm.pbf¨ and executed command osm2pgsql --append --slim -C 24500 --number-processes 8 south-america-latest.osm.pbf BUT i get error: 
COPY_END for COPY planet_osm_rels FROM STDIN;
 failed: ERROR:  duplicate key value violates unique constraint "planet_osm_rels_pkey"
DETAIL:  Key (id)=(2668952) already exists.
CONTEXT:  COPY planet_osm_rels, line 4301

What could be the problem? 

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