Cannot open user management

If i want to open the user management of the Community Builder in Joomla Backend I get the message
"count(): Argument #1 ($value) must be of type Countable|array, null given"

and this errors:

Notice: SQLXML::queryCount error returned: Commands out of sync; you can't run this command now in /var/www/ud14_308/html/ialb/libraries/CBLib/CBLib/AhaWow/Model/XmlQuery.php on line 351

Warning: Undefined variable $total in /var/www/ud14_308/html/ialb/libraries/CBLib/CBLib/AhaWow/Model/XmlQuery.php on line 353

Notice: SQLXML::queryObjectList: error: Commands out of sync; you can't run this command now in /var/www/ud14_308/html/ialb/libraries/CBLib/CBLib/AhaWow/Model/XmlQuery.php on line 392

Warning: Undefined variable $rowsArray in /var/www/ud14_308/html/ialb/libraries/CBLib/CBLib/AhaWow/Model/XmlQuery.php on line 395

I'm using Joomla 4.2.8 and the newest Version of Community Builder
Any idea, what can i do, to solve the Problem? Thank you

Those are notices and warnings they won't prevent actual access. Please enable debug mode and maximum error reporting in Joomla global configuration then navigate to CB > User Management and provide the full error callstack so I can see where that's coming from more specifically.

Many thanks for the tip. After the weekend, however, the problem "solved itself" and it works again (although I did nothing and clearing caches, changing browsers etc. on Friday did not help). If the problem occurs again, I will activate the DebugMode. I had already set the maximum error report.