Login Error - global.php on line 15 ??

[Goonie]

I've just installed a new skin and when clicking on the login link and then trying to sign in I get the error:

Warning: require(./includes/class_bootstrap.php) [function.require]: failed to open stream: No such file or directory in /home/USER/public_html/global.php on line 15

Warning: require(./includes/class_bootstrap.php) [function.require]: failed to open stream: No such file or directory in /home/USER/public_html/global.php on line 15

Fatal error: require() [function.require]: Failed opening required './includes/class_bootstrap.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/USER/public_html/global.php on line 15

I don't receive an error with my other styles.