Proxmox VE Web GUI is a Blank Page

But what do you see in the browser's dev tools as mentioned?
 
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I have done those steps.
Still getting response with an empty body:
Part of page source:
<body> <!-- Fields required for history management -->
<form id="history-form" class="x-hidden">
<input type="hidden" id="x-history-field"/>
</form>
</body>