Joomla! Template AT Vegeret - Item Support

i have just bought and installed the template. When i click on ADD TO CART, I am getting the following error:
0
Object of class stdClass could not be converted to string
I have installed the plugin but the error did not go away. what should i do next? thanks
i have sent an email to admin@agethemes.com with the admin login information. thanks.
Item Name:
AT Vegeret
Author:
Downloads:
867
Sales:
67
Created:
2016-09-16
Updated:
2019-09-30
Item Version:
4.0.0
$29.00 $21.75
Regular License
This item may be used for a single domain only.
$39.00 $29.25
Extended License

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