I've just updated Wordpress 3.2 on some webpage and it crashed with the following error:
Warning: require_once(/home/site/public_html/wp-includes/class-json.php) [function.require-once]: failed to open stream: No such file or directory in /home/site/public_html/wp-content/plugins/tweet-this/tweet-this.php on line 145
Fatal error: require_once() [function.require]: Failed opening required '/home/site/public_html/wp-includes/class-json.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/site/public_html/wp-content/plugins/tweet-this/tweet-this.php on line 145
I don't know the reason, but it seems that the 3.2 package is missing at least one file. You can grab it from here, it's the class-json.php file from the Wordpress 3.1.2 package.
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