the_title() not working inside singles?

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Having issues with the_title() not working inside any of your single post types? You may only need to wrap a loop around this.

Get the_title() to work inside a single post type

Inside the single file, you simply need to wrap the loop around the_title() as per the below example.

while ( have_posts() ) : the_post();
     the_title();
endwhile();