I have this twitter share button that pulls 100 characters from the content of the post and its URL for the twitter share.
<a class="popup"
href="http://twitter.com/share?url=<?php
echo urlencode(get_permalink($post->ID));
?>&text=<?php the_content_limit(100, "");?>">
<img src="http://zitatezumnachdenken.com/wp-content/uploads/2013/04/twittersmall.png" alt="twitter">
</a>
It's working but I always get the following validation error
Can someone help me?