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Call to undefined function get_field() in both functions files

  • If I try to use ACF inside my custom functions plugin, I get this error:

    Uncaught Error: Call to undefined function get_field() in

    On the other hand, if I try to use it inside my theme’s function.php file, I a theme error:

    Whoops \ Exception \ ErrorException (E_NOTICE)
    Trying to access array offset on value of type null

    My code:

    <?php
    
    $author_id = get_the_author_meta('ID');
    $author_badge = get_field('post_autor', 'user_'. $author_id );
    
    ?>
    <img src="<?php echo $author_badge['url']; ?>" alt="<?php echo $author_badge['alt']; ?>" />
    
    

    Using a Gantry5 theme.

    I already followed the documentation and read some posts with examples, but even so I’m not being able to get it to work.

    The field is set as User Object.

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