How can i solve my Error by Connecting golang with MongoDB?

Question

I have a problem with connecting the MongoDB to an API that is written in Golang. If you can help me, I would be really grateful. I don't find anything when I google it. To give a little context I am trying to complete this tutorial and in my opinion I have done it exactly like the guy from this medium post: https://medium.com/geekculture/build-a-rest-api-with-golang-and-mongodb-gin-gonic-version-6213083a86fe#id_token=eyJhbGciOiJSUzI1NiIsImtpZCI6ImIxYTgyNTllYjA3NjYwZWYyMzc4MWM4NWI3ODQ5YmZhMGExYzgwNmMiLCJ0eXAiOiJKV1QifQ.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.llhfgrPC1LaGzaf6evc-AhUaMsSJl529gC_Uc5BA1o1X9zzz0xxPtACth719hmYukLgnpKeU3UFTi74fUfHBA3vmg-9QgJY2vUamiiZNOJ5ZcufJEUAd37mqsOBA2_xghsr34aTKypO741pBsx-LDOa7fcIwTyeTrgJL3pQAYYPyri7O27eEsW-Khb3SWhnYpjv-WB7Eph6c4_jyNeiWf6CFAhMl4Xl-gbMaTiT2YIF9W_oNfQQyZ7OPMi0w1l2_7wSIxbTRrrGs_mlXZgaM5lHVqTh32G9SVNpsV6GGC57a1zISioKLEgEgGrphQ-7BBJ89Jqv_uewM8jVOMaFt7Q

My error:

2022/05/13 12:24:55 server selection error: context deadline exceeded, current topology: { Type: ReplicaSetNoPrimary, Servers: [{ Addr: cluster0-shard-00-01.muyyt.mongodb.net:27017, Type: Unknown }, { Addr: cluster0-shard-00-02.m
uyyt.mongodb.net:27017, Type: Unknown }, { Addr: cluster0-shard-00-00.muyyt.mongodb.net:27017, Type: Unknown }, ] }

My Files: .env

MONGOURI=mongodb+srv://eliah:[email protected]/myFirstDatabase?retryWrites=true&w=majority

env.go

package configs

import (
    "github.com/joho/godotenv"
    "log"
    "os"
)

func EnvMongoURI() string {
    err := godotenv.Load()
    if err != nil {
        log.Fatal("Error loading .env file")
    }

    return os.Getenv("MONGOURI")
}

setup.go:

package configs

import (
    "context"
    "fmt"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
    "log"
    "time"
)

func ConnectDB() *mongo.Client {
    client, err := mongo.NewClient(options.Client().ApplyURI(EnvMongoURI()))
    if err != nil {
        log.Fatal(err)
    }

    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    err = client.Connect(ctx)
    if err != nil {
        log.Fatal(err)
    }

    //ping the database
    err = client.Ping(ctx, nil)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Connected to MongoDB")
    return client
}

//Client instance
var DB *mongo.Client = ConnectDB()

//getting database collections
func GetCollection(client *mongo.Client, collectionName string) *mongo.Collection {
    collection := client.Database("golangAPI").Collection(collectionName)
    return collection
}

main.go:

package main

import (
    "gin-mongo-api/configs" //add this
    "github.com/gin-gonic/gin"
)

func main() {
    router := gin.Default()

    //run database
    configs.ConnectDB()

    router.Run("localhost:6000")
}