Error 404 of Form Builder tab in Forms application in Kentico 12

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Hello, Dang.

Unfortunately, the screenshot alone doesn't really tell us much. There are a number of reasons why you could be getting a 404. It may help us a lot more if you can provide us with more information. I recommend following this article in order to better share information on this issue:

• https://devnet.kentico.com/articles/wanna-get-better-and-faster-support-answers

Most importantly will be a description of what you are trying to achieve, and a description of anything you did before running into the error. Thank you!

Can you write down some 404 errors of Form Builder in Form application of Kentico 12? That error can be related to domain name, license or Web.config, etc. ?

If you are using MVC development model, make sure the presentation URL is correct and the live site is up and running. Then, there is no firewall or other network element blocking the communication between Kentico admin app and the live site app. I would also check the Event log and browser development tools to see if there is more detailed or other error message. If the admin app and live site are running on different domains, you may need to configure SameSite cookie. And also, make sure you are not using custom CSP or other headers in the config files which may be blocking the form builder.