Just purchased this, and I get an error message when I try

Just purchased this, and I get an error message when I try to make any changes.
Help!

Warning: Illegal string offset 'code' in /home/fairivy1/public_html/wp-content/plugins/sharebox/lib/class_wdsb_admin_pages.php on line 35

Warning: Cannot modify header information - headers already sent by (output started at /home/fairivy1/public_html/wp-content/plugins/sharebox/lib/class_wdsb_admin_pages.php:35) in /home/fairivy1/public_html/wp-includes/pluggable.php on line 876