title: Plugin generated XXX of unexpected output during activation
body: <p>The plugin generated 79 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.</p>
  
  <p>Code As Bellow</p>
  
  <pre><code>&lt;?php
  /*
  Plugin Name:Stock Notifier
  Plugin URI:
  Description: product out of stock.
  Version: 1
  */
  
  include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
  if ( is_plugin_active( 'woocommerce/woocommerce.php' ) || class_exists( 'WooCommerce' )) {
  
  
  class Stock_Notifier {
  
  } // End Class GIS_Stock_Notifier
  
  new Stock_Notifier();
  
  }else { ?&gt; 
  &lt;!-- When remove else then work perfect but i need display notice message --&gt;
  &lt;div class="update-nag notice"&gt;
      &lt;p&gt;First Install Woocoomerce Plugin&lt;/p&gt;
  &lt;/div&gt;  
  &lt;?php
  }
  </code></pre>
  
  <p>Plugin depend to woocommerce plugin. 
  When in else part <strong>Remove</strong> Start PHP and End PHP then <strong>work</strong> but How to print message of notice. </p>
  
  <p>Suggest me.
  Thanks.</p>