Hi I coudn’t success it.
Error - handler not found.
Could you help me please
I believe this was written for Kirby 1, not Kirby 2.
From this tweet, it looks like someone is working on a new comment system for Kirby 
I have solved it
We have to update ;
$handler_path = kirby()->roots()->content().'/smart-submit/'.$handler_name.'.php';
in template/smart-submit.php
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