Yet another Fatal error: Call to undefined function get_header() problem

Hello,
I have this message when I try to get on the page:

Fatal error: Call to undefined function get_header()in D:\XAMPP\htdocs\wordpress\wp-content\themes\3yard\identyfikacja.php on line 5

I’ve red several topics with this problem, but every suggest that there might be a problem with putting the content in the root directory. I have my template in wp-content/themes/my-theme directory. It works perfect with index, but not with the page. Dunno why. I found a tip somewhere to put @ before get_header, but this only makes the site go all white.

my code

<?php
/*
Template Name: identyfikacja
*/
get_header(); ?>
<?php query_posts ('cat=1&showposts=1');?>
<?php if (have_posts()):while (have_posts()) :the_post();?>
<?php the_content('');?>
<?php endwhile;?>
<?php endif;?>
<?php wp_reset_query;?>
<div id="pn">
<div>
<?php previous_post_link('%link', 'PREV', TRUE); ?> </div>
<div><?php next_post_link('%link', 'NEXT', TRUE); ?>
			</div>
		</div>

<?php get_footer(); ?>