Unlink error

[techker]

hey guys is there a way to fix getting an error 500 with unlink?

 

simple script.

$file = $_GET['File'];

    //chdir('/admin/uploads/big/'); 
    $do = unlink($file); 
    if($do=="1"){ 
        echo "The file was deleted successfully."; 
    } else { echo "There was an error trying to delete the file."; }