TypeError (no implicit conversion of String into Integer)

CarrierWave.configure do |config|
        config.fog_provider = 'fog/aws'
        config.fog_credentials = {
          provider: 'AWS',
          aws_access_key_id: 'MYKEY',
          aws_secret_access_key: 'MYKEY',
          region: 'eu-west-1'
        }
        config.permissions = '0666'
        config.fog_directory  = 'sushiartist'
      end

Processing by ShopsController#update as HTML
2016-09-26T17:15:59.794750+00:00 app[web.1]: Completed 500 Internal Server Error in 11ms
2016-09-26T17:15:59.783946+00:00 app[web.1]:   Parameters: {"utf8"=>"✓", "authenticity_token"=>"VPi4Svgup6sRCNXa1nwZPIIPVb0TY7re9pqQVewl15k=", "shop"=>{"name"=>"Pozas", "city"=>"Bilbao", "phone"=>"94 652 13 99", "direction"=>"Licenciado Poza, 50", "cover"=>#<ActionDispatch::Http::UploadedFile:0x007fd15cb0ba00 @tempfile=#<Tempfile:/tmp/RackMultipart20160926-3-1efzhcb>, @original_filename="york (1).png", @content_type="image/png", @headers="Content-Disposition: form-data; name="shop[cover]"; filename="york (1).png"rnContent-Type: image/pngrn">, "latitude"=>"43.2625685", "longitude"=>"-2.9425845000000663", "email"=>"", "proximamente"=>"0", "nuevo"=>"0"}, "commit"=>"Editar", "id"=>"5"}