Error: "subject" must be a string

I want to upload file and create folder using node.js backend REST APIs. To achieve my objective I used bellow link & used JWT .

I downloaded confifg.json and used it to create client.

Objective : Create a folder

Code:

var BoxSDK = require("box-node-sdk");

var config = require("../config/box.json");

router.get("/create_folder", function (req, res, next) {

try {

var sdk = BoxSDK.getPreconfiguredInstance(config);

var client = sdk.getAppAuthClient("user");

client.folders

.create("0", "Logfolder")

.then((folder) => {

console.log("->", folder);

res.json({ folder: folder });

})

.catch((error) => {

console.log("error-->", error);

});

} catch (err) {

console.log("error===>", err);

}

});

Error :

Error: "subject" must be a string

Error Line:

client.folders

.create("0", "Logfolder")

Please help me

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