Errormessage "Site exception"

We use the ARMember Lite plugin and have a customized login screen.
User logs in correctly, receives feedback that there was an error.

Traffic inspector shows “wp-admin/admin-ajax.php” POST HTTP 200 OK Site exception applied SE 1

Using wp-login.php for login, it works directly.
Traffic inspector shows HTTPS 200 OK SE 1

File admin-ajax.php corresponds to the file from wordpress 6.6.2

What is the “SE 1”-Icon?

This icon indicates that one software error (SE) was logged. Click the icon and scroll down to the “Software Errors” section to see details about the error.

Thanks for the info. The error is:

type: “E_DEPRECATED (8192)”
info: “reation of dynamic property Less_Tree_Operation::$parensInOp is deprecated”

or

type: E_DEPRECATED (8192)
info: "Creation of dynamic property MarkNewPosts_Options::$check_markup is deprecated
file: /xxxxxxx/wp-includes/functions.php

The functions.php is the original from wordpress.

If I deactivate wp-cerber login is possible without error. After activating wp-cerber I get an error while login whith the login page from the plugin ARMember Lite.

Have you enabled the Custom Login URL in the WP Cerber settings? If so, please disable it. Additionally, try enabling Defer rendering the custom login page.

Hi Nick, thanks for the tips. Now it works a bit better.

The site runs in German, I have also set WP Cerber in German.

I still sometimes get an error when trying to log in. In the traffic inspector I see the message like the screenshot

SE1 points to E_DEPRECATED (8192)

But what is meant by “Site exception applied”?

Where can I find in the details what the cause is here?
errormessage

The label should be Location Exception Applied. This status label indicates that a location-based (URL-based) exception has been configured and is in effect for this request. It could be either a Traffic Inspector exception or an Anti-spam exception. If you hover the mouse over the label and it shows 502, it’s an Anti-spam exception.