Floating Social - Non-static method Wdsb_PublicPages::serve() should not be called statically

I'm getting the following error message on every pageview. Can you assist?

Error message
Error: Non-static method Wdsb_PublicPages::serve() should not be called statically

Sample stack trace
… called at /home/hidden/public_html/wp-content/plugins/sharebox/
sharebox.php (78)
in include_once called at /home/hidden/public_html/wp-settings.php (273)
in require_once called at /home/hidden/public_html/wp-config.php (72)
in require_once called at /home/hidden/public_html/wp-load.php (39)
in require_once called at /home/hidden/public_html/wp-blog-header.php (13)
in require called at /home/hidden/public_html/index.php (17)