Hello! I have a problem and I need your help: although I am logged in as administrator I can't add images or files to my site (http://infoclasa.objectis.net). Every time I try I get this message:

We’re sorry, but there seems to be an error… Here is the full error message: Afiseaza traceback-ul ca text Traceback (innermost last): • Module ZPublisher.Publish, line 127, in publish • Module ZPublisher.mapply, line 77, in mapply • Module ZPublisher.Publish, line 47, in call_object • Module Products.CMFPlone.FactoryTool, line 446, in __call__ • Module ZPublisher.mapply, line 77, in mapply • Module ZPublisher.Publish, line 47, in call_object • Module Products.CMFFormController.FSControllerPageTemplate, line 91, in __call__ • Module Products.CMFFormController.BaseControllerPageTemplate, line 28, in _call • Module Products.CMFFormController.ControllerBase, line 231, in getNext • Module Products.CMFFormController.Actions.TraverseTo, line 38, in __call__ • Module ZPublisher.mapply, line 77, in mapply • Module ZPublisher.Publish, line 47, in call_object • Module Products.CMFFormController.FSControllerPythonScript, line 107, in __call__ • Module Products.CMFFormController.ControllerBase, line 231, in getNext • Module Products.CMFFormController.Actions.TraverseTo, line 38, in __call__ • Module ZPublisher.mapply, line 77, in mapply • Module ZPublisher.Publish, line 47, in call_object • Module Products.CMFFormController.FSControllerPythonScript, line 105, in __call__ • Module Products.CMFFormController.Script, line 145, in __call__ • Module Products.CMFCore.FSPythonScript, line 130, in __call__ • Module Shared.DC.Scripts.Bindings, line 324, in __call__ • Module Products.PloneHotfix20110531, line 106, in _patched_bindAndExec • Module Shared.DC.Scripts.Bindings, line 361, in _bindAndExec • Module Products.PythonScripts.PythonScript, line 344, in _exec • Module script, line 1, in content_edit Line 1 • Module Products.CMFCore.FSPythonScript, line 130, in __call__ • Module Shared.DC.Scripts.Bindings, line 324, in __call__ • Module Products.PloneHotfix20110531, line 106, in _patched_bindAndExec • Module Shared.DC.Scripts.Bindings, line 361, in _bindAndExec • Module Products.PythonScripts.PythonScript, line 344, in _exec • Module script, line 13, in content_edit_impl Line 13 • Module Products.LinguaPlone.I18NBaseObject, line 411, in processForm • Module Products.Archetypes.BaseObject, line 661, in processForm • Module Products.Archetypes.BaseObject, line 769, in _renameAfterCreation • Module transaction._manager, line 99, in savepoint • Module transaction._transaction, line 253, in savepoint • Module transaction._transaction, line 250, in savepoint • Module transaction._transaction, line 647, in __init__ • Module ZODB.Connection, line 1128, in savepoint • Module ZODB.Connection, line 606, in _commit • Module ZODB.Connection, line 651, in _store_objects • Module ZODB.Connection, line 1292, in storeBlob • Module ZODB.Connection, line 1321, in _getBlobPath • Module ZODB.Connection, line 1334, in temporaryDirectory AttributeError: Storage instance has no attribute temporaryDirectory

What should I do to be able to add images or files?