Question: I have an include file that includes the header and footer of my site. But in the header I use an active class to let the menu-item change when on that page. How can you achieve this using one include file? With PHP?

I found this:

index.php

```
<?php $page == 'one'; include('includes/header.php'); ?>

```

header.php

```
<li>
      <a <?php echo ($page == 'one') ? "class='active'" : ""; ?> 
             href="contact.php">Contact</a>/</li>

```

But it's not changing, when I just used the class on every page seperately, it worked.

Answer: 
My hostname which is localhost did not contain any underscores.The only underscore was in my computer name.My old name was `computer_1` but i changed it to `computer1` and now i am able to use `localhost:8161` activemq web console.

To know how to change the computer name when on windows,do google it or refer to windows documentation.This error has nothing to do with hostname proper but rather the computer name.
Check your "activemq.log" in your "data" folder, in my case I obtain this error because I was using a "redeliveryPlugin" and it requires a schedulerSupport="true" in broker definition.