Using import_logs.py - Errormessage "Name or service not known"

Hello,

I hope somebody can help me, because I don't know how to fix the error I get using import_logs.py.
I'm using Piwik 1.12.

This is my command:

python import_logs.py --url=http://www.domainname.de/piwik/ ../../../../logfiles/112013/access_log_2013-11-23.txt --debug

I tried it several times with different parameters but every time I get the following error:

2013-11-24 08:46:08,199: [DEBUG] Accepted hostnames: all
2013-11-24 08:46:08,199: [DEBUG] Piwik URL is: http://www.domainname.de/piwik/
2013-11-24 08:46:08,199: [DEBUG] No token-auth specified
2013-11-24 08:46:08,199: [DEBUG] No credentials specified, reading them from "/xx/yy/zz/www/main/piwik/config/config.ini.php"
2013-11-24 08:46:08,201: [DEBUG] Using credentials: (login = USERNAME, password = AUTH_TOKEN)
2013-11-24 08:46:08,203: [DEBUG] Error when connecting to Piwik: <urlopen error [Errno -2] Name or service not known>
2013-11-24 08:46:10,206: [DEBUG] Error when connecting to Piwik: <urlopen error [Errno -2] Name or service not known>
2013-11-24 08:46:12,207: [DEBUG] Error when connecting to Piwik: <urlopen error [Errno -2] Name or service not known>
Fatal error: [Errno -2] Name or service not known

Am I misusing the URL-Paramter? I tried only www.domainname.de and got the same error.
I also tried using the parameter --login and --password … same result.
I hope somebody can help me.

Greetings,
Jens