Mapping Plugin Fatal PHP Errors

Just today found these errors in my PHP error logs. Far as I can tell, the mapping function is working properly.

I'm running the latest versions of WP and Domain Mapping.

Any ideas?

[08-Aug-2013 20:22:46 UTC] PHP Warning: mysql_real_escape_string(): 18 is not a valid MySQL-Link resource in /home/temporal/public_html/wp-includes/wp-db.php on line 880
[08-Aug-2013 20:22:46 UTC] PHP Warning: mysql_error(): 18 is not a valid MySQL-Link resource in /home/temporal/public_html/wp-includes/wp-db.php on line 1206
[08-Aug-2013 20:45:48 UTC] PHP Fatal error: Call to undefined function set_domainmap_dir() in /home/temporal/public_html/wp-content/plugins/domain-mapping/domain-mapping.php on line 48
[08-Aug-2013 20:46:59 UTC] PHP Fatal error: Call to undefined function set_domainmap_dir() in /home/temporal/public_html/wp-content/plugins/domain-mapping/domain-mapping.php on line 48
[08-Aug-2013 20:47:13 UTC] PHP Fatal error: Call to undefined function set_domainmap_dir() in /home/temporal/public_html/wp-content/plugins/domain-mapping/domain-mapping.php on line 48