Selected Custom Template, Got Blank Page

Hey, I’m new to writing php, but I uploaded single-fullwidth.php, selected the Full Width template, but it returns a blank page.
The code I’m using for the full width template is:

<?php
/*
Template Name Posts: Full Width
*
/?>
get_header(); ?>

the_content();

<?php if ( have_posts() ) : while( have_posts() ) : the_post();
     the_content();
endwhile; endif; ?>

<?php do_action( 'cyberchimps_before_container'); ?>

<?php do_action( 'cyberchimps_page_content' ); ?>

<?php do_action( 'cyberchimps_after_container'); ?>

<?php get_footer(); ?>

Appreciate any and all ideas you have for fixing this

https://www.ads-software.com/plugins/custom-post-template/