purge fails to run

[juruen@…]

2009/04/27 08:17:03 DEBUG> ModelProvider.pm:246 EBox::Model::ModelProvider::AUTOLOAD - Trace begun at /usr/share/perl5/EBox/Model/ModelProvider.pm line 245
EBox::Model::ModelProvider::AUTOLOAD('EBox::Logs=HASH(0x8e95b10)', 'configureLogTable/keys/conf2485/lifeTime', 168) called at /usr/share/perl5/EBox/Types/Select.pm line 266
EBox::Types::Select::_storeInGConf('EBox::Types::Select=HASH(0xa58e7d0)', 'EBox::Logs=HASH(0x8e95b10)', 'configureLogTable/keys/conf2485') called at /usr/share/perl5/EBox/Types/Abstract.pm line 351
EBox::Types::Abstract::storeInGConf('EBox::Types::Select=HASH(0xa58e7d0)', 'EBox::Logs=HASH(0x8e95b10)', 'configureLogTable/keys/conf2485') called at /usr/share/perl5/EBox/Model/DataTable.pm line 877
EBox::Model::DataTable::addTypedRow('EBox::Logs::Model::ConfigureLogDataTable=HASH(0xa5983bc)', 'HASH(0xa5bb19c)', 'readOnly', undef, 'id', undef) called at /usr/share/perl5/EBox/Model/DataTable.pm line 805
EBox::Model::DataTable::addRow('EBox::Logs::Model::ConfigureLogDataTable=HASH(0xa5983bc)', 'domain', 'printers', 'enabled', 1, 'lifeTime', 168) called at /usr/share/perl5/EBox/Logs/Model/ConfigureLogDataTable.pm line 151
EBox::Logs::Model::ConfigureLogDataTable::syncRows('EBox::Logs::Model::ConfigureLogDataTable=HASH(0xa5983bc)', 'ARRAY(0xa5b4cb0)') called at /usr/share/perl5/EBox/Model/DataTable.pm line 1561
EBox::Model::DataTable::ids('EBox::Logs::Model::ConfigureLogDataTable=HASH(0xa5983bc)') called at /usr/share/perl5/EBox/Logs.pm line 813
EBox::Logs::purge('EBox::Logs=HASH(0x8e95b10)') called at /etc/cron.hourly/90manageEBoxLogs line 20
2009/04/27 08:17:03 ERROR> ModelProvider.pm:248 EBox::Model::ModelProvider::AUTOLOAD - Undefined method set
2009/04/27 08:17:03 INFO> Service.pm:600 EBox::Module::Service::restartService - Restarting service for module: events
2009/04/27 08:17:03 ERROR> GConfConfig.pm:77 EBox::GConfConfig::backup - Cannot change a read only module instance
2009/04/27 08:17:03 ERROR> Service.pm:605 EBox::Module::Service::__ANON__ - Error restarting service: Cannot change a read only module instance