PGP-Error with Horde

[Paul]

Hi all,

when I try to generate a gpg-key in horde or try to use an uploaded pair of 
keys I get the same error reportet here:

http://lists.horde.org/archives/imp/Week-of-Mon-20061002/046215.html

Logfiles:

/kolab/var/apache/log/horde/horde.log: 

Feb 08 22:16:48 HORDE [debug] [imp] Public/Private keypair not generated 
successfully. Returned error message: gpg: keyblock resource 
`--output/secring.gpg':
 file open error
gpg: keyblock resource `--output/pubring.gpg': file open error
usage: gpg [options] [filename]


/kolab/var/apache/log/php/php-errors.log

[08-Feb-2009 22:26:19] PHP Warning:  mkdir() [<a 
href='function.mkdir'>function.mkdir</a>]: No such file or directory 
in /var/kolab/lib/php/Horde/Util.php on line 517

Any idea?

cheers
paul