theme Autofocus pro hangs

Hi

I do have a problem
I’ve bought the theme Autofocus pro and installed it.
Further I tried to activate this theme.
then Igot the message:
Fatal error: Call to undefined function thematic_before_widget() in /home/dondigi/domains/architectuur-interieurfotografie.nl/public_html/wordpress/wp-content/themes/autofocuspro/extensions/thematic-functions.php on line 732
Can anyone help me please

thanks in advance

Rene