[horde] Fatal error in options' menu

[Volker Then]

Hi,

I'm getting a fatal error in the options menu of nag, mnemo and genie:

Fatal error: Call to a member function on a non-object in 
/var/www/html/horde-cvs/nag/templates/common-header.inc on line 21

Fatal error: Call to a member function on a non-object in 
/var/www/html/horde-cvs/meno/templates/common-header.inc on line 21

Fatal error: Call to a member function on a non-object in 
/var/www/html/horde-cvs/genie/templates/common-header.inc on line 18

The options of any other Horde application (imp, kronolith, whups and 
others) are working correctly.

Please advice.

Thanks

Volker