Warning: require(//wp-blog-header.php) [function.require]: failed to open stream: No such file or directory in /index.php on line 19

Warning: require(//wp-blog-header.php) [function.require]: failed to open stream: No such file or directory in /index.php on line 19

Fatal error: require() [function.require]: Failed opening required '//wp-blog-header.php' (include_path='.:/:/usr/local/php5/lib/pear') in /index.php on line 19