In left aside menu error clicking on group Menu

I have left menu at page with group header and subitems
It is under credentials 111111

But with page above opened I can switch it clicking on “Manage Users” group label,
but clicking on parent “Manage Storage” label I got error :

popper.js:1201 Uncaught TypeError: Cannot read property 'setAttribute' of null
    at Object.applyStyleOnLoad [as onLoad] (popper.js:1201)
    at popper.js:2483
    at Array.forEach (<anonymous>)
    at new Popper (popper.js:2481)
    at Dropdown.toggle (bootstrap.js:1575)
    at HTMLAnchorElement.<anonymous> (bootstrap.js:1724)
    at Function.each (jquery-3.3.1.min.js:2)
    at w.fn.init.each (jquery-3.3.1.min.js:2)
    at w.fn.init._jQueryInterface [as dropdown] (bootstrap.js:1709)
    at HTMLAnchorElement.<anonymous> (bootstrap.js:1881)

added popper.js file to layout of my app:

     <script src="{{ asset('js/jquery-3.3.1.min.js') }}"></script>

    <script src="{{ asset('js/moment.min.js') }}"></script>

    <script src="{{ asset('/js/popper.js') }}"></script>
    <script src="{{ asset('/js/bootstrap.js') }}"></script>

But I am not sure if this is relative library with header:

>  * @fileOverview Kickass library to create and place poppers near their reference elements.
>  * @version 1.14.6

If to comment popper.js file I got other console error:
bootstrap.js:1553 Uncaught TypeError: Bootstrap dropdown require Popper.js (

  1. How to fix it?
  2. Could you please to propose to make thisd left menu look better? I tried to select group items and subitems, but seems they are not very good looking?


Linking to a password-locked backend page isnt helpful.

What loader are you using? asset() isnt a standard javascript call.
What element are you trying to make a bootstrap dropdown? Show us the element definition that is causing popper to be invoked.

I mentioned at my message that I provided password

Please, you can login and look at it

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