I just bought a Pop Rock Pro theme and was trying to upgrade it (first I tryied it for free), but I am now very unsatisfied with it. I can’t import demo nor can I make customize the theme. It is giving the same message all the time: Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/astridnolvak.com/public_html/wp-content/themes/pop-rock-pro/inc/custom-header.php:1) in /home/customer/www/astridnolvak.com/public_html/wp-includes/functions.php on line 6221
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