The form does not have a name. Use the 'name' attribute to assign a name to the form

You were trying to use the 'Read the form from a web page' option in Simfatic Forms. Simfatic Forms requires that you have a 'name' to the form. The name is required to identify the form.

Update your form page and add a name attribute to your form.
Example:
<form name='mycontactform' action='something.php' method='post'>