panic: error parsing uri (mongodb+srv://USER:PWD@cluster-test.mongodb.net/admin?ssl=true&retryWrites=true&readPreference=secondary&readPreferenceTags=dc:ny,rack:1&readPreferenceTags=dc:ny&readPreferenceTags=): invalid value for readPreferenceTags: 

tags := []map[string]string{map[string]string{"dc": "ny", "rack": "1" }, 
                            map[string]string{ "dc": "ny" }, 
                            map[string]string{}}
tagSets := tag.NewTagSetsFromMaps(tags)
readPrefOption := []readpref.Option{readpref.WithTagSets(tagSets...)}
readPreference, err := readpref.New(readpref.Secondary().Mode(), readPrefOption...)
if err != nil {
    panic(err)
}
opts := options.Client().ApplyURI(mongoURI).SetReadPreference(readPreference)
client, err := mongo.NewClient(opts)
if err != nil {
    panic(err)
}