Hi fadbeck,

To better assist you, please include more specific details about your problem.

Tips for getting forum questions answered
http://documentation.concrete5.org/tutorials/tips-getting-forum-que...

First, I just editing my website, then I went to add-on and installing some free add-ons. I just installed about 6 free add-ons for layout, live chat, blocks, tec. But, when I want to checked my website to began editing again, the error occured.

That just what I've done before I got the error.

And today, when I login in my concrete5 account, and after login, when I see my website again, I was been told to login again.

I would like to say thank you for your response.

I am using
Core Version - 8.1.0
Version Installed - 8.1.0
Database Version - 20170123000000

And I am using Neat (0.9.2) theme.

@fadbeck

Were you working with Express objects or the Form block?

I think I work with form block,
I installed the free theme and editing them

I think I work with form block,
I installed the free theme and editing them

@fadbeck

This may be related to this issue (deleting an express entity or form):
Express\Form\Renderer::__construct() must implement \Express\Form\FormInterface #5361
https://github.com/concrete5/concrete5/issues/5361...

Have you tried going back to a previous page version?
https://documentation.concrete5.org/editors/in-page-editing/versions...