Error in domain mapping plugin

Hello,

I've got those errrors in my logs:

[Thu Dec 20 14:03:03 2012] [error] [client 176.58.107.XXX] PHP Warning: Missing argument 2 for domain_map::swap_mapped_url(), called in /nas/wp/www/cluster-121xx/xxxxxx/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 504 and defined in /nas/wp/www/cluster-121xx/xxxxx/wp-content/plugins/domain-mapping/classes/class.domainmap.php on line 1027

It's recent. Would you have an idea of where this could come from?

Thank you very much for your help