[Plugin: WordPress Popular Posts] Including Tweet Button in WordPress Popular Posts

Hello. I’m trying to incorporate the Tweet Button on WordPress Popular Posts, but when clicking the button, it says there is an invalid URL. The code I’m using for it:

<iframe allowtransparency="true" frameborder="0" scrolling="no"
        src="http://platform.twitter.com/widgets/tweet_button.html?url=<?php echo urlencode(get_permalink($post->ID)); ?>&via=itsalltech&text=<?php wp_title(''); ?> | <?php bloginfo('name'); ?>"
        style="width:130px; height:50px;">
</iframe>

[Please post code snippets between backticks or use the code button.]

Any ideas? Thanks.

http://ww.wp.xz.cn/extend/plugins/wordpress-popular-posts/