[google-appengine] Can't find import "google.golang.org/appengine"

[william]

I'm trying to deploy an API on AppEngine but I'm not sure why it's not 
working, here's an extract of the code: 

package main 

import (
    "encoding/json"
    "io/ioutil"
    "net/http"
    "fmt"

    "google.golang.org/appengine"
)


func main () {
    InitPubSub()

    http.HandleFunc("/", HandlerBase)
    http.HandleFunc("/user", HandlerUser)
    http.HandleFunc("/event", HandlerEvent)

    appengine.Main()
}

I'm getting the following error when I try to deploy the app (gcloud app 
deploy): main.go:9: can't find import: "google.golang.org/appengine"

I've followed the installation guide: 
https://cloud.google.com/appengine/docs/standard/go/download

And downloaded the appengine package: go get google.golang.org/appengine

Thanks!

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