Sidebar installation

Hello!

Foreword
I am addressing this community, because I no longer know what to do, and I hope that I can get help here. I have to say that I am a newcomer in WordPress, but in other areas I got ‘relatively’ more expirience (forums, and writing php)

Now to the problem:
I have ‘WordPress version 2.3.3 DE Edition’ (I am from Germany) and have installed me the nice theme ‘ChaoticSoul 1.0 by Bryan Veloso’. Now I heard from good looking widgets. Well, I thought, give it a try!. Thought, done, and I have failed… When clicking on widgets in Admin Panel it just shows ‘There was no defined Sidebar’. I am not one of the ones who imediately run to the next best possible forum to do an order and escape from own work. I have tried everything possible, I take the sidebar.php, but could not find any suspicious there…
Here the code od it:

<div id="sidebar">

        <?php include (TEMPLATEPATH . '/searchform.php'); ?>

        <?php if (is_single()) { ?>

            <h3>About This Post</h3>
            <p class="postmetadata alt">
                <small>
                    This entry was posted
                    <?php /* This is commented, because it requires a little adjusting sometimes.
                        You'll need to download this plugin, and follow the instructions:
                        https://binarybonsai.com/archives/2004/08/17/time-since-plugin/ */
                        /* $entry_datetime = abs(strtotime($post->post_date) - (60*120)); echo time_since($entry_datetime); echo ' ago'; */ ?>
                    on <?php the_time('l, F jS, Y') ?> at <?php the_time() ?>
                    and is filed under <?php the_category(', ') ?>.
                    You can follow any responses to this entry through the <?php comments_rss_link('RSS 2.0'); ?> feed. 

                    <?php if (('open' == $post-> comment_status) && ('open' == $post->ping_status)) {
                        // Both Comments and Pings are open ?>
                        You can <a href="#respond">leave a response</a>, or <a href="<?php trackback_url(true); ?>" rel="trackback">trackback</a> from your own site.

                    <?php } elseif (!('open' == $post-> comment_status) && ('open' == $post->ping_status)) {
                        // Only Pings are Open ?>
                        Responses are currently closed, but you can <a href="<?php trackback_url(true); ?> " rel="trackback">trackback</a> from your own site.

                    <?php } elseif (('open' == $post-> comment_status) && !('open' == $post->ping_status)) {
                        // Comments are open, Pings are not ?>
                        You can skip to the end and leave a response. Pinging is currently not allowed.

                    <?php } elseif (!('open' == $post-> comment_status) && !('open' == $post->ping_status)) {
                        // Neither Comments, nor Pings are open ?>
                        Both comments and pings are currently closed.

                    <?php } edit_post_link('Edit this entry.','',''); ?>

                </small>

            <h3>Navigate</h3>

            <ul class="navigation">
                <?php previous_post_link('<li>Previous: <strong>%link</strong></li>') ?>
                <?php next_post_link('<li>Next: <strong>%link</strong></li>') ?>
            </ul>    

        <?php } else { ?>

            <!-- Author information is disabled per default. Uncomment and fill in your details if you want to use it.
            <li><h2>Author</h2>
            A little something about you, the author. Nothing lengthy, just an overview.

            </li>
            -->

            <?php /* If this is a 404 page */ if (is_404()) { ?>
            <?php /* If this is a category archive */ } elseif (is_category()) { ?>
            <h3>About This Page</h3>
            You are currently browsing the archives for the <?php single_cat_title(''); ?> category.

            <?php /* If this is a yearly archive */ } elseif (is_day()) { ?>
            <h3>About This Page</h3>
            You are currently browsing the <a href="<?php bloginfo('home'); ?>/"><?php echo bloginfo('name'); ?></a> weblog archives
            for the day <?php the_time('l, F jS, Y'); ?>.

            <?php /* If this is a monthly archive */ } elseif (is_month()) { ?>
            <h3>About This Page</h3>
            You are currently browsing the <a href="<?php bloginfo('home'); ?>/"><?php echo bloginfo('name'); ?></a> weblog archives
            for <?php the_time('F, Y'); ?>.

      <?php /* If this is a yearly archive */ } elseif (is_year()) { ?>
            <h3>About This Page</h3>
            You are currently browsing the <a href="<?php bloginfo('home'); ?>/"><?php echo bloginfo('name'); ?></a> weblog archives
            for the year <?php the_time('Y'); ?>.

         <?php /* If this is a monthly archive */ } elseif (is_search()) { ?>
            <h3>About This Page</h3>
            You have searched the <a href="<?php echo bloginfo('home'); ?>/"><?php echo bloginfo('name'); ?></a> weblog archives
            for <strong>'<?php echo wp_specialchars($s); ?>'</strong>. If you are unable to find anything in these search results, you can try one of these links.

            <?php /* If this is a monthly archive */ } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
            <h3>About This Page</h3>
            You are currently browsing the <a href="<?php echo bloginfo('home'); ?>/"><?php echo bloginfo('name'); ?></a> weblog archives.

            <?php } ?>

            <h3>Pages</h3>
                <ul>
                <?php wp_list_pages('title_li='); ?>
                </ul>

            <h3>Archives</h3>
                <ul>
                <?php wp_get_archives('type=monthly'); ?>
                </ul>

            <h3>Categories</h3>
                <ul>
                <?php wp_list_cats('sort_column=name&optioncount=1&hierarchical=0'); ?>
                </ul>

        <?php } ?>

    </div>

I would be very pleased, and the week beginning would also make sense if someone could help, or at least give a relevant notice, Please!

greetings sebaseba