How to make a theme unable to be used on a multisite network?

This is right from the codex page, http://codex.wordpress.org/Function_Reference/is_multisite

<?php if ( is_multisite() ) { echo 'Multisite is enabled'; } ?> 

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)