WordPress MU errors when setting up

Hi, Have just setup a WPMU network, this is my third attempt as the previous two attempts gave me multiple errors. This attempt has thrown up two errors (please see below). Can anyone explain how I can resolve these errors?

review-uk.com [Mon Jun 24 16:17:23 2013] [error] [client 79.170.44.6:46791] AH01215: Use of uninitialized value $config{“subdomain”} in substitution iterator at setup_script.cgi line 124, <IFILE> line 51.
review-uk.com [Mon Jun 24 16:17:23 2013] [error] [client 79.170.44.6:46791] AH01215: Use of uninitialized value $config{“subdomain”} in substitution iterator at setup_script.cgi line 124, <IFILE> line 59.