If you get this error message when submitting a web form, then something in the form submission is corrupted.
Common causes are:
If you get this error message when submitting a web form, then you have triggered Infusionsoft anti-spam web form filter. This is often caused by trying to submit too frequently to a single form from one IP address. This most commonly happens when trying to use forms to work around API limitations, or when testing a form and doing too many tests too quickly.