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I cloned your form and tried to do a test submission. I initially got the same error so I tried to look deeper. Looks like your IENS ID is set to default value. I tried to put zero, saved the form and tried to submit again and it worked. Kindly set it to a number you desired and try again. Select the IENS ID then click on Default Value on the toolbar. See image below:
Please let us know if you need further help.
We apologize for the inconvenience you have faced. This problem is related to google spreadsheet integration. So, could you please remove the existing integration and re-integrate it if that resolve the glitch.
Please see the image below to know how to remove integration.
Feel free to contact us if the issue persist.