Create lookalike audience Facebook API with several countries -

i trying create lookalike audiences via facebook api, finding users in several countries. 1 country works fine, whenever try several countries error message:

{ message: '(#2654) invalid lookalike spec: please ensure lookalike spec has valid parameters'}

here json parameters sent request:

{     "name":"snorkeling vacation guide: lookalike visitors",     "subtype":"lookalike",     "origin_audience_id":"6063046728433",     "lookalike_spec":{        "allow_international_seeds":true,        "type":"similarity",        "location_spec":{           "geo_locations":{              "countries":[                 "us",                 "ca",                 "uk",                 "de",                 "se",                 "ie"              ]           }        }     },     "description":"lookalike audience visitors of snorkeling vacation guide"  }

does have experience this? thanks!