WordPress plugin sends only text/plain email

In my site i use “Another WordPress Classified Plugin” https://awpcp.com

This plugin sends an email when a user posts an ad on the site.
But html emails doesn’t work
I see the email like a text/plain.

I include html email in a php file in the plugin template folder. (frontendtemplates)

I think the problem is in the main functions.php ( here is it https://pastebin.com/TTTb2qPz ).

I have tried to edit a boolean value called $html=false. But the problem isn’t this.

Thaks for help.

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