Kings Widget Framework broke my WordPress

Hi,

I installed Kings Widget Framework and then it completely broke my WordPress.

I get this error message in my admin: Fatal error: Call to undefined function: get_admin_page_title() in /home/woonder/public_html/wp-admin/admin-header.php on line 12

And this line appears on my site: Warning: widget_king_links_register(widgets.php) [function.widget-king-links-register]: failed to open stream: No such file or directory in /home/woonder/public_html/wp-content/plugins/king-links.php on line 519

Warning: widget_king_links_register() [function.include]: Failed opening ‘widgets.php’ for inclusion (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/woonder/public_html/wp-content/plugins/king-links.php on line 519

Are there ways to reverse the damage? You can see my site at: woonder.sg

Thank you!