import_logs.py error

Hello
I get an error when I run the script to import logs
Is it the content or formatting of the log file?
thanks for your help

-bash-3.2$ /usr/bin/python2.6 /appli/projects/piwik/apache_2.2.11/htdocs/piwik/misc/log-analytics/import_logs.py --url=http://zet3300c --idsite=3 /var/projects/piwik/apache_2.2.11/log/piwik/access.log

0 lines parsed, 0 lines recorded, 0 records/sec
Parsing log /var/projects/piwik/apache_2.2.11/log/piwik/access.log…
37 lines parsed, 0 lines recorded, 0 records/sec
37 lines parsed, 0 lines recorded, 0 records/sec
37 lines parsed, 0 lines recorded, 0 records/sec
37 lines parsed, 0 lines recorded, 0 records/sec
Fatal error: Internal Server Error

Check your server error logs?

-bash-3.2$ /usr/bin/python2.6 /appli/projects/piwik/apache_2.2.11/htdocs/piwik/misc/log-analytics/import_logs.py --url=http://zet3300c --idsite=3 /var/projects/piwik/apache_2.2.11/log/piwik/access.log
0 lines parsed, 0 lines recorded, 0 records/sec
Parsing log /var/projects/piwik/apache_2.2.11/log/piwik/access.log…
37 lines parsed, 0 lines recorded, 0 records/sec
37 lines parsed, 0 lines recorded, 0 records/sec
37 lines parsed, 0 lines recorded, 0 records/sec
37 lines parsed, 0 lines recorded, 0 records/sec
Fatal error: Internal Server Error
You can restart the import of “/var/projects/piwik/apache_2.2.11/log/piwik/access.log” from the point it failed by specifying --skip=0 on the command line.

the apache log shows the following message:
[Thu December 13 10:54:08 2012] [error] [client 10.122.133.25] PHP
Fatal error: Class ‘Piwik_Config’ not found in / appli/projects/piwik/apache_2.2.11/htdocs/piwik/core/Tracker / config.php on line 603

is anyone can help me if you please
thanks

I would try and update php and see if that helps.

Do you have any odd plugins installed?

What server and PHP versions are you running?