kabcclient export script don't work with cron

I don't know, whether it's a PIM-problem. If not, please tell me.

I make scheduled backups with cron, that works fine.

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
# m h dom mon dow user	command
17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report  
/etc/cron.daily )
47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report  
/etc/cron.weekly )
52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report  
/etc/cron.monthly )
0	10-20	*	*	*	root	/home/USER/Scripte/SicherungAufNAS
30	10-20	*	*	*	root	/home/USER/Scripte/KAddressbook_Export_vCard
#

Now I want to export KAddressbook contacts within a script.

#!/bin/sh
# KAddressbook_Export_vCard
kabcclient -L > /home/USER/contacts_hourly_backkup.vcf
#

As a script started manually in the console, it works fine. But if cron  
starts the script, only an empty file is created.

The user  permissions seem to be ok:

-rwxrwxr-x 1 USER GROUP  822 2011-11-16 12:56 KAddressbook_Export_vCard

Any suggestions please?


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