Unique Question: Update error text

I have a unique question in my form. Where do I find the "Sorry! Only one entry is allowed." message? It's not listed under Form Warnings, and I need to change it to say "Sorry! That email address is already registered. Please try again using a different email." Otherwise they won't know why they can't submit their form.

Unfortunately, there is currently no option to update this text.

I will forward this to our developers as a feature request, and as soon as we hear back from our Developers, we will let you know.

Thank you for your patience.