mongodb atlas cluster golang insert struct slice interface context canceled, current topology

When I insert a set of documents into a MongoDB Atlas collection I get the following error message:

2021/12/23 09:37:03 server selection error: context canceled, current topology: { Type: ReplicaSetNoPrimary, Servers: [{ Addr: cluster-attitude-shard-00-00.o7pjk.mongodb.net:27017, Type: Unknown }, { Addr: cluster-attitude-shard-00-01.o7pjk.mongodb.net:27017, Type: Unknown }, { Addr: cluster-attitude-shard-00-02.o7pjk.mongodb.net:27017, Type: Unknown }, ] }

I use the next code:

interfaz_slice := ToInterfaceSlice(students)

_, err := coleccion.InsertMany(ctx, interfaz_slice)

The function "ToInterfaceSlice" recieve a slice of structs and return a slice of interface

I do not understand where I am making a mistake

Thanks in advance

New part of question:

File fragment "main.go":

func main() {

	var students []data.TypeStudent

	absPath, _ := filepath.Abs("data/students.csv")

	students = data.LeerFichero(absPath)

	data.ConectaBD()

	data.InsertaColleccionEstudiantes(students)

}

File fragment "students.go":

type TypeStudent struct {
	FirstName string `bson:"first_name" json:"first_name"`
	LastName  string `bson:"last_name" json:"last_name"`
	Class     string `bson:"class" json:"class"`
}

func ToInterfaceSlice(lista []TypeStudent) []interface{} {
	iface := make([]interface{}, len(lista))
	for i := range lista {
		iface[i] = lista[i]
	}
	return iface
}

File fragment "basedatos.go":

func ConectaBD() {

	cliente_local, err := mongo.NewClient(options.Client().ApplyURI(cadena_conexion))
	if err != nil {
		log.Fatal(err)
	}
	ctx, cancelar = context.WithTimeout(context.Background(), 10*time.Second)
	err = cliente_local.Connect(ctx)
	if err != nil {
		log.Fatal(err)
	}
	defer cancelar()

	mongo_cliente = cliente_local.Database("attitude")

	log.Println("[+]Connected to MongoDB Atlas")

}

func InsertaColleccionEstudiantes(students []TypeStudent) {

	coleccion = mongo_cliente.Collection("students")

	interfaz_slice := ToInterfaceSlice(students)

	log.Println("[+]A slice of interfaces are inserted directly into MONGODB")

	_, err := coleccion.InsertMany(ctx, interfaz_slice)

	if err != nil {
		log.Fatal(err)
	}

}

Information is not sufficient. Check if IP is whitelisted or not. Also specify which context you are using. You can try with context.TODO().

I tried and it's working fine.

Make sure your connection is successful. Also close the connection using defer.

Here is the sample code you can try with this :

client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(uri))
	if err != nil {
		panic(err)
	}
	defer func() {
		if err = client.Disconnect(context.TODO()); err != nil {
			panic(err)
		}
	}()

	// begin insertMany
	coll := client.Database("insertDB").Collection("haikus")
	docs := []interface{}{
		bson.D{{"title", "Record of a Shriveled Datum"}, {"text", "No bytes, no problem. Just insert a document, in MongoDB"}},
		bson.D{{"title", "Showcasing a Blossoming Binary"}, {"text", "Binary data, safely stored with GridFS. Bucket the data"}},
	}

	result, err := coll.InsertMany(context.TODO(), docs)
	if err != nil {
		panic(err)
	}

For better understanding please refer this link : https://raw.githubusercontent.com/mongodb/docs-golang/master/source/includes/usage-examples/code-snippets/insertMany.go