can't build the project

[wrick198]

error information:
cluster.go:16:2: cannot find package "github.com/go-redis/redis/v7/internal" in any of:

In this project, there is no v7, why?

[wrick198]

in cluster.go:
import (
"context"
"crypto/tls"
"fmt"
"math"
"math/rand"
"net"
"runtime"
"sort"
"sync"
"sync/atomic"
"time"

"github.com/go-redis/redis/v7/internal"
"github.com/go-redis/redis/v7/internal/hashtag"
"github.com/go-redis/redis/v7/internal/pool"
"github.com/go-redis/redis/v7/internal/proto"

)
However, there is no project "github.com/go-redis/redis/v7/internal" in any of place.
why?

[vmihailenco]

You need to use recent Go version and activate Go module support - https://github.com/golang/go/wiki/Modules#how-to-install-and-activate-module-support