The logo is not displayed on the page in Wordpress, what is the reason?

Question

Images

The question is: I'm making a WordPress theme (studying) using bootstrap.
In the header file, I made the logo a link and set the path to the image:

<div class="navbar-wrapper">
    <div class="navbar navbar-fixed-top">
    <div class="navbar-inner">
      <div class="container">
      <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </a>
      <a class="brand" href="<?php echo site_url(); ?>"><img src="wp-content/uploads/logo.png"></a>
    <nav class="pull-right nav-collapse collapse">
      <ul class="nav"> <br>
      <?php wp_list_pages(array('title_li' => '','exclude' => 11)); ?> 
      </ul>
    </nav>
      </div>
        </div>
      </div>
    </div>

Then I made pages to create the menu. But the image-logo itself is displayed only on the main page, and not on the rest. What could be the problem and how to fix it? Thanks in advance.

Answer 1

<img src="<?php echo get_home_url() ?>/wp-content/uploads/logo.png">