rellax.js initialization

rellax.js.initialization

jQuery(document).ready( function() {

  var rellax = new Rellax('.rellax', {
    speed: -2,
    center: false,
    wrapper: null,
    round: true,
    vertical: true,
    horizontal: false
  });

})

I am getting error with this initialization code on code block JavaScript section

I am getting error with this initialization code on code block JavaScript section

This is what I've used:

`
jQuery(document).ready( function() {

var rellax = new Rellax('.rellax');

})
`

and it got rid of the error. Working on the front end also.

Is there a non-jquery alternative?