'postman Pre-request Scropt Unexpected token u in JSON at position 0

I have a post man collection that every route has a Pre-request Script like this

const loginUrl = pm.environment.get("reportingUrl") + "auth/login";
console.log(loginUrl)
pm.sendRequest({
    url: loginUrl,
    method: 'POST',
    header: {
        'content-type': 'application/json',
        'X-CustomHeader': '7cadd7a13b4ba65c0db1dcc6d4bb29ab'
    },
    body: {
        mode: 'raw',
        raw: JSON.stringify({"username": pm.environment.get("companyUser"),
                             "password": pm.environment.get("companyPass") })
        }
}, function (err, res) {
    pm.environment.set("auth",  res.json().token);
});

when I send the request the red dot appears in the right of `Pre-request Script and this error shows up

There was an error in evaluating the Pre-request Script:Error: Unexpected token u in JSON at position 0

these requests are working on another computer.

any idea why this is happening ?

postmanpostman-pre-request-script


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