Need Help Displaying Images in Themer Layout

Hello!

I'm having trouble getting an image to display in my themer layout. I'm trying to use a posts module in my themer layout that uses a metabox image upload field called 'headshot' instead of the featured image.

The layout I'm working on is https://ncmcolumbus.com/stories

Here's the HTML I'm writing in the posts module:

    
        
          
        
        
          [wpbb post:link text="title"]
          [wpbb post:meta_box field='designation' date_format='']
        
    </div>
      [wpbb post:excerpt length="55" more="..."]
      <p class="dgtl-read-more-text">
        [wpbb post:link text="custom" custom_text="Read More »"]
    </p>
</div>

I'm getting the following PHP error:

Notice: Array to string conversion in /.../wp-includes/shortcodes.php on line 319

I think the issue is because themer needs a single image URL and the shortcode generates an array. I'm not sure if there is a variable I can add to the shortcode to fix it or if I need to do something on the field code itself to make the field return a single file URL instead of the array.

I'm still pretty new with PHP. Thank you for your help!