Send email error

[AndyB72]

admincp -> user groups -> Users waiting confirm email

I select one of them and try to send him password.

This is answer:

Fatal error: Call to a member function query_read_slave() on a non-object in /home/vitainca/public_html/core/login.php on line 297

[Derwin]

I have the exact same problem with my new install of vbulletin 5.

Does anybody have a resolution to this?