In publishing, uuid module can't be found

Apps
1

Hi all, I’m trying to create an app so I can import the energy generated from my solarpanels (APSystems). In developing with Visual Studio code, I can create API requests fine. But not when I publish a test version. This throws an error.
The code with the UUID in it is:
> console.log(‘API request called’);

    const crypto = require("crypto");
    const axios = require("axios"); 
    const { v4: uuidv4 } = require("uuid");
    const nonce = uuidv4().replace(/-/g, "");
    const timestamp = Date.now().toString();
    const signature_method = 'HmacSHA256';
    const apiKey = api_Key;
    const apiSecret = String(api_Secret);

But trying to add the device in the app, the following error appears:

UUID_error
UUID_error381×276 14.7 KB

Did I do something wrong, or is the development environment different from the test environment?
As you might have guessed, I’m not a professional developer, just having a hobby :blush:

Regards, Dick