Domain mapping error message on live site

I’m running a wp network and have domain mapping installed. Up until recently it seemed to be working okay but now the website is getting this error:

Warning: call_user_func_array() []: First argument is expected to be a valid callback, ‘domain_map::domain_mapping_siteurl’ was given in /home/mypodcas/public_html/wp-includes/plugin.php on line 170

It only appears to be on the pages where there are images because imageless pages don’t display this message.

I tried rolling back the plugin to an older version but no luck so now I’m back the most recent version.

Any thoughts?


PS – sorry but I need some help quickly as this site is live. thx…