Reply To: Error opening forums
ok, the function that is being called is ‘suffusion_bbpress_content_class’ which tells us that this is a function created by the theme suffusion. bbpress functions start ‘bbp_’.
You have put (intentionally or not) a file into your child them called
‘wp-content/themes/suffusionchild/single-forum.php’
which is an amendment of bbpress’s single-forum.php.
After googling I found this post which seems to describe your issue and the resolution, which is to remove the bbpress files from your child theme.
