Warning: Illegal string offset appearing on home page

First off, I know nothing about how to code. I think this is caused by an update to PHP but don’t know how to fix it. It just showed up as an overlay on my site newberrycheer.com last week. Can anyone help?

Warning: Illegal string offset ‘css_section’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 407

Warning: Illegal string offset ‘css_elem’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 408

Warning: Illegal string offset ‘option_group’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 409

Warning: Illegal string offset ‘std_id’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 411

Warning: Illegal string offset ‘section_id’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 412

Warning: Illegal string offset ‘placeholder_new’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 414

Warning: Illegal string offset ‘choices’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 418

Warning: Illegal string offset ‘placeholder_new’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 419

Warning: Illegal string offset ‘desc’ in /home4/kvstarkc/public_html/nhs/wp-content/themes/Super_Bowl/functions.php on line 42

I know I need to do something to the functions.php but have no idea what….many thanks,
kate