Finally, the page.tpl.php should be like this:
.
.
.
<!-- #sidebar -->
<?php if ($page['sidebar_first']):?>
<div class="grid_4">
<div id="sidebar" class="clearfix">
<?php print render($page['sidebar_first']); ?>
</div>
</div>
<?php endif; ?>
<!-- EOF: #sidebar -->
<?php if ($page['sidebar_first']) { ?>
.
.
.
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