Fatal error

Hallo,

I've tried to install the BeTheme and its Plugins.

But I can't install the Envato WordPress Toolkit. I get the message:
  1. The destination folder already exists . / home / u52851 / public_html / wp -content / plugins / Envato WordPress Toolkit master /
    The plugin installation has failed .



    And in the frontend I only see the message:

    Fatal error: Call to undefined function is_product() in /home/u52851/public_html/wp-content/themes/betheme/functions/theme-head.php on line 772

    What can I do?

    Thanks a lot!

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