'Mapbox configuration is not working. Can not pass access token

I'm trying to implement geocoding to my express app and I decided to use MapBox client API. However when I tried to configure it, it's still throwing following error. Please help me

Error: Cannot create a client without an access token
    at NodeClient.MapiClient (D:\NODE COURSE\Colt Steele\DerpCamp\node_modules\@mapbox\mapbox-sdk\lib\classes\mapi-client.js:25:11)
    at new NodeClient (D:\NODE COURSE\Colt Steele\DerpCamp\node_modules\@mapbox\mapbox-sdk\lib\node\node-client.js:7:14)
    at createNodeClient (D:\NODE COURSE\Colt Steele\DerpCamp\node_modules\@mapbox\mapbox-sdk\lib\node\node-client.js:24:10)
    at D:\NODE COURSE\Colt Steele\DerpCamp\node_modules\@mapbox\mapbox-sdk\services\service-helpers\create-service-factory.js:13:16
    at Object.<anonymous> (D:\NODE COURSE\Colt Steele\DerpCamp\src\controllers\CampgroundController.js:6:18)

Here is my configuration

const Geocoding = require('@mapbox/mapbox-sdk/services/geocoding')
const map_token = process.env.MAPBOX_TOKEN
const geocoder = Geocoding({accessToken: map_token})

VERY IMPORTANT NOTE

There is no space between MAPBOX_TOKEN and my actual api key in my dev.env file.



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