Typically when you are getting this error, it may be because you have “add guest addressing” selected, and it is trying to add addresses for your entire guest list. Since you will likely be reordering a smaller amount, you can either turn the feature off, uncheck the addresses that you already have envelopes for, or type in new addresses if you have not added the guests to your guest list yet.
For any issues with ordering, please reach out to support@zola.com for help.