Fatal error in Newsletter Widget

Hi there,

I have a problem with the newsletter widget. The following error message appears after the entry:
Fatal error: Cannot redeclare class NewsletterWidget in /www/htdocs/xxxxxxx/wp-content/plugins/newsletter/widget.php on line 164

I hope it’s just a small problem and you can help me. Here is an extract from the source code:

159  <p>Use the tag {subscription_form} to place the subscription form within your personal text.
160  </p>
161  <?php
162  }
163  
164  }
165
166  add_action('widgets_init', create_function('', 'return register_widget("NewsletterWidget");'));
167  ?>

My site: http://www.brigitta-kemner.com/ihr-weg-zu-mir/

Thank you

ps: please excuse my bad english …