I'm getting the following error: "Fatal error: Call to undefined function get_post_thumbnail_id()". What should I do?

Please complete the following steps:

1) Go to the plugin settings page;

2) Open "Custom code" tab, mark "Activate" checkbox in the "Editing bws-custom-code.php" section;

3) Add the following code:

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

4) Mark "Activate" checkbox and save changes.

 

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