ROOT_PATH

pls help!

Been trying to solve this error message below,

Warning: include(C:\xampp\htdocs\blog\blog\admin\topics\app\includes\adminHeader.php): failed to open stream: No such file or directory in C:\xampp\htdocs\blog\blog\admin\topics\create.php on line 25

Warning: include(): Failed opening 'C:\xampp\htdocs\blog\blog\admin\topics\app\includes\adminHeader.php' for inclusion (include_path='.:/path/you/installed/pear/to/') in C:\xampp\htdocs\blog\blog\admin\topics\create.php on line 25.


I am trying to set a root path for my header and sidebar.