WP Author post avatar after Post title

[kipspatie22]

I have tried some recommendations but it doesn’t seems to work well. The code below just shows an empty image without my gravatar pic used by my email.

<header class="entry-header">
		<div class="container">
			<div class="row">
				<div class="col-lg-12 col-md-12">
					<?php the_title( '<h1 class="entry-title animated fadeInUp">', '</h1>' ); ?>
					<?php if ( 'post' == get_post_type() ) : ?>
						<div class="startright-entry-meta">
				<?php echo get_avatar( get_the_author_email(), '50' ); ?>
							<?php startright_posted_on(); ?>
						
						</div>
					<?php endif; ?>
				</div>
			</div>
		</div>
	</header>

The code

<?php echo get_avatar( get_the_author_email(), '50' ); ?>

doesnt works well.
Is there another way (as of PHP Code) to add author image as shown in the image above?