CS forms - simple contact form 404 error

Support
#1

Hello there
I’m pretty sure, I did everything what Josh said here, but the component part (not necessary):
https://www.youtube.com/watch?v=9uq0SMeFKY8

as soon as I hit the submit button, I get 404 and no form submission is saved in the back end “form submissions” part.

What am I missing?

EDIT: wp forms plugin works.

#2

Pretty please?

#3

I have the same problem, I set up a simple contact form with just the Email Action, as soon as I hit the Submit button I get a blank page with a 404 error. Can’t really figure out what I’m missing.

#4

Hey @VRANKOVINA,

This is possibly caused by a 3rd party plugin. Please deactivate all 3rd party plugins and test again. If it doesn’t work, please keep the 3rd party plugins deactivated while we investigate.

Thanks.

#5

All plugins but CS Forms deactivated. Problem persists.

#6

Hello @VRANKOVINA,

It appears there might be an aggressive caching issue. I added the contact form to the same page with a redirect, and it’s now working correctly. I have kept in hidden mode. Please unhide it and verify the settings.

VP-Contact-Page-Cornerstone-03-27-2026_04_41_PM

Hope it helps
Thanks

#7

Well. If so, then it must be a server side setting because I do not have any wp caching activated. No caching system installed yet.
OK: Your form works, mine doesnt. Let’s figure out why. I really followed Josh’s instructions, so right now, uhh… wt… anyway. I will find the bugger.

#8

Glad to hear that @VRANKOVINA

#9

OK. first: It works - sort of.

What did I:

  1. I just simply duplicated the form
  2. I added a text input for the name. The form still works.
  3. I added a E-Mail action before the redirect rule, and I’m getting 404 again.
  4. removing the E-Mail action, the 404 remains.
  5. removing the new text input field, the form works - at least it redirects and submits in the backend.
  6. adding back the text input field, the form miraculously works.
  7. adding back the email action results in an error message: Email Action : Call to undefined function PHPMailer\PHPMailer\mail()
    wp mail smtp plugin was turned off.
  8. turning on the wp mail smtp plugin the form works.

I’m not exactly sure the “creator” intended such a gauntlet for the most simple form task on a website. I have no caching plugin installed nore any server caching enabled.

Reliability? Well, I guess I’ll need to test some 100x before being sure?

#10

Hi @VRANKOVINA,

I tested the contact form and I was able to submit it successfully. Your settings seems to be correct now.

Let us know if the error comes back. Thanks!

#11

@nabeel: why do I need the wp mail smtp plugin to make it work? And was the E-Mail by “[email protected]” from you?

#12

Hey @VRANKOVINA,

Like other form plugins, Cornerstone Forms uses the mail function of WordPress. In some web hosts, that mail function does not work. SMTP plugins bypass that so that’s why it’s needed in most cases.

It’s possible that the email you mentioned was from my colleague.

#13

That makes sense. Thank you for the elaboration.

#14

You’re most welcome @VRANKOVINA

#15

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