Erfurt error while using csvimport extention

[shinobu]

[copied from AKSW/OntoWiki as it was the false repository for the question] from Iseliva

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The following error appears after installation the csvimport extension when trying to import CSV data:

No valid user was given.
Erfurt_Ac_Exception

/var/www/OntoWiki/libraries/Erfurt/library/Erfurt/Ac/Default.php@570 
#0: Erfurt_Ac_Default->_getUser@/var/www/OntoWiki/libraries/Erfurt/library/Erfurt/Ac/Default.php:335
#1: Erfurt_Ac_Default->areModelsAllowed@/var/www/OntoWiki/libraries/Erfurt/library/Erfurt/Store.php:2271
#2: Erfurt_Store->_checkAcBatch@/var/www/OntoWiki/libraries/Erfurt/library/Erfurt/Store.php:878
#3: Erfurt_Store->getAvailableModels@/var/www/OntoWiki/extensions/modellist/ModellistModule.php:31
#4: ModellistModule->init@/var/www/OntoWiki/application/classes/OntoWiki/Module.php:151
#5: OntoWiki_Module->__construct@/var/www/OntoWiki/application/classes/OntoWiki/Module/Registry.php:284
#6: OntoWiki_Module_Registry->getModule@/var/www/OntoWiki/application/classes/OntoWiki/View.php:206
#7: OntoWiki_View->module@/var/www/OntoWiki/application/classes/OntoWiki/View.php:152
#8: OntoWiki_View->modules@/var/www/OntoWiki/application/classes/OntoWiki/Controller/Base.php:195
#9: OntoWiki_Controller_Base->preDispatch@/var/www/OntoWiki/libraries/Zend/Controller/Action.php:502
#10: Zend_Controller_Action->dispatch@/var/www/OntoWiki/libraries/Zend/Controller/Dispatcher/Standard.php:295
#11: Zend_Controller_Dispatcher_Standard->dispatch@/var/www/OntoWiki/libraries/Zend/Controller/Front.php:954
#12: Zend_Controller_Front->dispatch@/var/www/OntoWiki/libraries/Zend/Application/Bootstrap/Bootstrap.php:97
#13: Zend_Application_Bootstrap_Bootstrap->run@/var/www/OntoWiki/libraries/Zend/Application.php:366
#14: Zend_Application->run@/var/www/OntoWiki/index.php:188

Ubuntu Server 12.04

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