PHP Notices: Constat DOMAINMAPPING_ALLOWMULTI already defined...

Please have your devs look into fixing these notices:

[05-Oct-2014 20:41:27 UTC] PHP Notice: Constant DOMAINMAPPING_ALLOWMULTI already defined in /public_html/wp-content/plugins/domain-mapping/domain-mapping.php on line 38

[05-Oct-2014 20:41:32 UTC] PHP Notice: Constant DOMAINMAPPING_ALLOWMULTI already defined in /public_html/wp-content/plugins/domain-mapping/domain-mapping.php on line 38

Running plugin v4.2.0.1.