How to config radik server with custom mongoDBUrl?

can someone send an example of configured radik server ( don’t send me a link to official github repository, i saw it)

When run example of server :

const express = require('express');

const { setup } = require('radiks-server');

const app = express();

    mongoDBUrl: 'mongodb://...',
}).then(RadiksController => {
  app.use('/radiks', RadiksController);

I get error when try to save data - Error: Error when validating: No signing key is present with id: `