Cannot search local installation

Hi Chisss,

Please follow this link to find an explanation of the problem you’re having:
http://stackoverflow.com/a/18380507

mysql_real_escape_string needs a valid link identifier (returned by mysql_connect()), see http://php.net/manual/en/function.mysql-real-escape-string.php
link_identifier: The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If no connection is found or established, an E_WARNING level error is generated.

And here:
http://stackoverflow.com/a/22728123/1078570

You just need setup your WordPress to have an active connection to MySQL.