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I've inserted all the files properly, on where they need to be, but this happens:

https://rysuki.xyz/images/jfuwi.mp4

Just a screenshot if you don't trust the link:

Here is a fix for this error.
Deactivate the plugin and go to your filemanager..

Open admin/styles/Whisper/style.php, find (line 280):

$class = $classes = '';

change it to or replace that with this below line :- 

$class = '';
$classes = [];

and after done this activate the plugin again. Check if is working.