Symfony web debug toolbar error 500

Hello. In Symfony I have a base.html.twig file with a Bootstrap template. Using this template in my other view files at the beginning of each file I am extending this template.
When I use the code: {% extends 'base.html.twig' %} I get the bootstrap layout but I even get the error: An error occurred while loading the web debug toolbar (500:.). Do you want to open the profiler?
Clicking ok I get this:


If I take out {% extends 'base.html.twig' %} then I don’t get this error anymore.
Still trying to find out what I am doing wrong. Would appreciate some help.

I should also say, that I am using FSOUserBundle, so maybe in that error is referring to that login.html.twig. To overwrite the FSOUserBundle templates I have created this folders: /FOSUserBundle/views under Resources. The I simply copied the views folder from the main friendsofsymfony/user-bundle/Resources

Here is the code for my base template and the welcome page that extends the base.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">
    <link rel="icon" href="../../favicon.ico">
    <title>Welcome</title>
    <!-- Bootstrap core CSS -->
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet">

    <link rel="icon" type="image/x-icon" href="{{ asset('favicon.ico') }}" />
</head>
<body>
<nav class="navbar navbar-inverse">
    <div class="container">
        <div class="navbar-header">
            <ul>
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                {% block welcome %}{% endblock %}
                {% block admin %}{% endblock %}
            </ul>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                {% block addRecord %}{% endblock %}
            </ul>
            <div id="navbar" class="navbar-collapse collapse">
                {% block signIn %}{% endblock %}
                {% block logout %}{% endblock %}
            </div>
        </div><!--/.nav-collapse -->

    </div>
</nav>
<div class="container">
    <div class="row">
        <div class="col-md-12">
            <!--/main body for page content -->
            {% block body %}{% endblock %}
        </div>
    </div>
</div><!-- /.container -->
</body>
</html>

Welcome page that extends the base template:

{% extends 'base.html.twig' %}
{% block welcome %}
    <a class="navbar-brand" href="{{ path('quiz_default_welcome') }}">Welcome</a>
{% endblock welcome %}
{% block signIn %}
    <ul class="nav navbar-nav navbar-right">
        <li>
            <a id="log_in" href="/login">
                <input type="button" class="btn btn-link" value="Sign In" />
            </a>
        </li>
    </ul>
{% endblock signIn %}
{% block body %}
    <div class="row">
        <div class="col-md-4"></div>
        <div class="col-md-4">
            <div id="usertoplay" class="form-group">
                <a href="/welcome/play">
                    <input type="button" class="btn btn-success" value="Play Quiz" />
                </a>
            </div>
        </div>
        <div class="col-md-4"></div>
    </div>
{% endblock %}

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