If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
Are you still getting the "invalid" message? If so, could you write us a support request from within the Site Builder application? Login as usual, then click on Help --> Contact Support, then fill in a brief summary of problem on the form. The message will have some extra data included, that will give us more information to work from.