CSS Form Builder Error Not Specifying

I have created 3 forms with CSS form builder 2 out of 3 work. My final is a survey that I would like people to take, I have cutom made it 2 times and still result in an error which is

When the user fills out the form, the page refreshes, keeping the information but not specifying what the issue is the link starts as this

satisfaction_survey.php

and ends as this

satisfaction_survey.php?invalid=true

and the form doesn't send.

What does this mean?

please send a copy of your page so I can examine the code.

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I'm sorry, I just attached the html page for the form, I guess that is easier. Thanks so much for your help.

delete line 15:
$WAFV_Errors .= undefined;

that is not valid code.

Jason, I just made that change and it appears to have no effect. I fill out the form and it refreshes ending in invalid=true. Attached is the updated code with line 15 removed. -Thank you so much!

to trouble shoot, change this code:

if ($WAFV_Errors != "")  {

    PostResult($WAFV_Redirect,$WAFV_Errors,"satisfactionsurvey");

  }

to:

if ($WAFV_Errors != "")  {

die($WAFV_Errors);

    PostResult($WAFV_Redirect,$WAFV_Errors,"satisfactionsurvey");

  }

this write a comma separated list to the screen showing which validation failed for troubleshooting.

Ok, I changed the code in the form and submited the form again, and I still have the same response. I'm not sure if this code was supposed automatically do something or if I don't understand a step after I change the code. Attached is the update html.