URL through custom field returning null

I have added an image through advanced custom field. I want to retrieve image URL. I have tried with following code. It is returning null.

 $url = get_field('aboutus_img','aboutus');

aboutus_img = field name
aboutus = field group name

Answers:

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Method 1

Refer ACF link : Link

And use

<?php echo get_field('aboutus_img'); ?>

Choose option image url

This example demonstrates how to display the selected image when using the Image URL return type. This return type allows us to efficiently display a basic image but prevents us from loading any extra data about the image.

<?php if( get_field('image') ): ?>
    <img src="<?php the_field('image_field_name'); ?>" />
<?php endif; ?>

Method 2

ACF provides good documentation about this function, which shows that it has the following signature:

get_field($selector, [$post_id], [$format_value]);

• $selector (string) (Required) The field name or field key.
• $post_id (mixed) (Optional) The post ID where the value is saved. Defaults to the current post.
• $format_value (bool) (Optional) Whether to apply formatting logic. Defaults to true.

You probably need to get the post ID, if you are working outside of a loop – like:

$url = get_field('aboutus_img', get_post_ID() );

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