Removing Sliding Widgets plugin create include errors

So I updated my plugins, then I uninstalled my Sliding Widgets plugin and now I get the following warning messages in the admin panel and above the header of my site:

Warning: include(shortcodes.php): failed to open stream: No such file or directory in /homepages/14/d442309306/htdocs/app572581842/wp-content/themes/shopkeeper/functions.php on line 2

Warning: include(): Failed opening 'shortcodes.php' for inclusion (include_path='.:/usr/lib/php5.5') in /homepages/14/d442309306/htdocs/app572581842/wp-content/themes/shopkeeper/functions.php on line 2

Any ideas on how I could rectify this?

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UPDATE:
My first few lines in my functions.php were:

<?php
    include('shortcodes.php');
    // theme textdomain - must be loaded before redux
    load_theme_textdomain( 'shopkeeper', get_template_directory() . '/languages' );

But I commented the include('shortcode.php'); to see what would happen. It made the warnings go from above the header of my site, which is great, however now on my login page I only get the following warning appearing on the page and can no longer log in:

Warning: Cannot modify header information - headers already sent by (output started at /homepages/14/d442309306/htdocs/app572581842/wp-content/themes/shopkeeper/functions.php:1) in /homepages/14/d442309306/htdocs/app572581842/wp-includes/pluggable.php on line 1196

What my functions.php looks like currently:

<?php
        // include('shortcodes.php');
        // theme textdomain - must be loaded before redux
        load_theme_textdomain( 'shopkeeper', get_template_directory() . '/languages' );

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