turned off active W3 total cache by mistake

So you’re getting the following error:

Fatal error: Call to undefined function wp() in /home/superblo/public_html/wp-blog-header.php on line 14

This is usually caused by an error in your “wp-config.php” file. Open this file (it’s found in your root folder) and check if all the settings are OK. (For example, is your database password and username correct? Do all the characters display fine?) If needed, delete all the contents, replace it with the “wp-config-sample.php” file (which contains the default settings), and reconfigure.