Hi!

What version of Joomla and SEBLOD are you using?

What type of fields?

What are the user rights?

I use joomla 3.10.11 and seblod 3.23.1. The template is gantry 5.5.15
The problem has changed to:
I created a 6 page form. Configuration: stage 6. Each side 1 field and a next button.
The first page is displayed, click on next - the form stays on page 1 and does not change to page 2

1. Stage: textarea
2. Stage: radiofield
all other Stages: textfields 

Access: Public
Permissions: Public - create, edit, edit Own: Allowed

Hello, 

I had the same with J4 Seb4. Just adding catid in the form make it work. Don't know why.

Hello, I have the exact same problem since I upgraded to PHP 8.0, Seblod 4.x and Joomla 4.X. You say that the problem can be solved by putting “Catid” ... that's nice ... but where and what element should you modify? Thank you in advance for more concrete clarification!

Hello,

It was about a seblod form for article as content object, I first don't have catid like field in the form. Just adding field catid in the form  have solved the problem. Have you update with the new version of seblod ?

Good morning, Thank you for your prompt response. Yes Joomla and Seblod are up to date with the latest version. I'm going to see if I can add a "Catid" field...is it really a "Concatainer" field? What is surprising is that on the same site, I have another “Contact” tool, also made with SeBlod, which works perfectly!?!?

catid is a basic core field in article form. His name is Article Category Id, which correspond to #__content.catid

Yes, there are a lot things surprising now with J4S4. But it's on the way ti be corrected, I think.

Good morning, Thank you for your clarification. I looked in my form, there is indeed an “Article” > “JForm Category ID” field, but the error message still appears, no email copy is sent, however Joomla has an article which has was created by Seblod, on the content of the form...but empty...apart from the information linked to the article (Author, Category, Date, etc.)!?!? What is surprising is that not only did all this work under Joomla 3.x and SeBlod 3.x...and since the transition to versions 4.x, only this form no longer works. As mentioned in my other message, the 2nd form, dedicated to “Contact”, works perfectly!?!? For the moment, I cannot determine the cause of this problem. Thank you in advance for helping me out!

Sorry, but I can't help you any more. I have just discovered by chance that adding Article Category Id in my form resolve my problem, but I don't know why...

Good morning, ...thank you anyway for trying! I hope someone finds a solution to this problem and lets us know. For my part, I will continue looking.

in my form i get the same error when switching to PHP 8. 

This is line 245:
$config['storages'][static::$table]['_']->pk = static::$pk;