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Can you provide a screenshot to show us where exactly you receive the error? I see that you have some forms created in your account, but they don't have any fields in them.
You need to add fields to your form in order to be able to submit them.
Are you receiving the mentioned error when you drag & drop the fields to your form? I also suggest you to read the following guide: https://www.jotform.com/help/2-How-to-Create-Your-First-Web-Form