Session expired error when an existing user login with event registration form

Not sure what's causing this bug. We are using Community Builder on our website.

Settings:
User Registration integration = Yes
Use CB API = Yes

When a visitor tried to register for an event by logging in as an existing user using the individual registration form, it shows the following error:

When a visitor registers as a new user using the individual registration, it works fine.

I'm guessing this is because the EB Login Form is trying to login but there's a conflict with CB's login.

Hello

It causes by CB System plugin. I don't remember exactly it's parameter, but you can edit that plugin, set two parameters below to No:

- Rewrite URL
- Redirect URL

After that, try again. It should solve the issue

Regards,

Tuan