Unable to log into admin interface

I haven’t tried to log in for a while, but now I’m getting this error:
Fatal error: Call-time pass-by-reference has been removed; If you would like to pass argument by reference, modify the declaration of e2w_migrate_legacy_headers(). in /hermes/walnaweb04a/b717/pow.susanrm/htdocs/susanmidlarskywp/wp-content/themes/smallbiz/functions.php on line 467

I haven’t changed anything on the site in quite some time, so I’m guessing it’s related to an upgrade. The developer isn’t offering support anymore. Any suggestions?

The page I need help with: [log in to see the link]