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Your form seems to be working normally just fine as of checking. I don't see any issues. Check the following screen.
Do you still encounter this problem? Can you please try to clear your browser's cache and see if it helps? I have also performed a clear cache with your forms here as well. Please let us know if you continue to see this error on your side.
Thanks and apologies for the inconveniences caused.
P.S. By the way, if you're interested, you might want to check these free wedding themes. :)
I get an error that says INVALID CONFIGURATION
AND THE WHOLE THING IS LOST - I have a bride who is annoyed because she spent time answerinfg the whole thing and then lost it when the submission didn't go through.
Upon checking your wedding form, I'm unable to replicate the problem that your customer had.
I would recommend that you enable your form's auto fill feature so that your user's can continue filling out the form without losing the original data input earlier. You can check the screenshot below or this guide that we have: http://www.jotform.com/help/227-How-to-Enable-Auto-Fill-Feature
Regarding the error, if it is possible, can you ask the customer what device and browser she is using? We can further investigate by then. We'll wait for your response.