Fatal error: Call to undefined function get_post_thumbnail_id() in /home/*****/portfolio-post.php on line 18

Please go to the plugin settings page, open "Custom code" tab, mark "Activate" checkbox in the "Editing bws-custom-code.php" section and add the following code:

add_action( 'after_setup_theme', 'theme_setup' );
function theme_setup() {
    add_theme_support( 'post-thumbnails' );
}

 

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