o que significa esse erro?

por favor oq significa esse erro?

Warning: include(cabecalho.php) [function.include]: failed to open stream: No such file or directory in C:\wamp\www\admin\index.php on line 11

Warning: include() [function.include]: Failed opening 'cabecalho.php' for inclusion (include_path='.;C:\php5\pear') in C:\wamp\www\admin\index.php on line 11