[turba] A storage backend for DAV has not been configured.

[z0bi0t]

Hello,

We have just upgraded from  H4.0.13+I5.0.18+T3.0.11 to stable
H5.1.2+I6.1.3+T4.1.1 and disabled the support for DAV:

DAV Settings
$conf[davstorage][driver] - Disable CalDAV/CardDAV support

Trying to create new address book, the following fatal error is
thrown back:

A fatal error has occurred
A storage backend for DAV has not been configured.
Details have been logged for the administrator.

The address book is actually created but the error is annoying.

Thanks for any idea, David