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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I took a look at your account and I do not see any signs of it being over quota or limit.
Seeing however that you were on free plan before today, I see that you have exceeded the number of payments allowed for the free plan - which is 10 per month. That is probably the cause of your error and now, since you are on paid plan, you no longer have the same limits.