Error Omeka Storage Exception.

Hi everyone.
I'm using Omeka for a school task.
I have to deliver it in by the first of June, but I can't seem to pass this problem.
I can't add any files.
I already tried to fix it with Putty working in OpenShell nothing worked.
I have the 2.02 version of Omeka

Another problem is also the file that doesn't exist have other permissions. On every other file the permission is for the root, but this one is on another username and I can't change it.

This is the message I get

Omeka_Storage_Exception

Destination directory is not writable: '/var/www/omeka/files/original'.

#0 /var/www/omeka/application/libraries/Omeka/Storage/Adapter/Filesystem.php(116): Omeka_Storage_Adapter_Filesystem->_rename('/tmp/71fc54a961...', '/var/www/omeka/...')
#1 [internal function]: Omeka_Storage_Adapter_Filesystem->store('/tmp/71fc54a961...', 'original/71fc54...')
#2 /var/www/omeka/application/libraries/Omeka/Storage.php(67): call_user_func_array(Array, Array)
#3 /var/www/omeka/application/models/File.php(435): Omeka_Storage->__call('store', Array)
#4 /var/www/omeka/application/models/File.php(435): Omeka_Storage->store('/tmp/71fc54a961...', 'original/71fc54...')
#5 /var/www/omeka/application/models/Job/FileProcessUpload.php(23): File->storeFiles()
#6 /var/www/omeka/application/libraries/Omeka/Job/Dispatcher/Adapter/Synchronous.php(25): Job_FileProcessUpload->perform()
#7 /var/www/omeka/application/libraries/Omeka/Job/Dispatcher/Default.php(136): Omeka_Job_Dispatcher_Adapter_Synchronous->send('{"className":"J...', Array)
#8 /var/www/omeka/application/models/File.php(209): Omeka_Job_Dispatcher_Default->send('Job_FileProcess...', Array)
#9 [internal function]: File->afterSave(Array)
#10 /var/www/omeka/application/libraries/Omeka/Record/AbstractRecord.php(277): call_user_func(Array, Array)
#11 /var/www/omeka/application/libraries/Omeka/Record/AbstractRecord.php(550): Omeka_Record_AbstractRecord->runCallbacks('afterSave', Array)
#12 /var/www/omeka/application/models/Item.php(322): Omeka_Record_AbstractRecord->save()
#13 /var/www/omeka/application/models/Item.php(235): Item->saveFiles()
#14 [internal function]: Item->afterSave(Array)
#15 /var/www/omeka/application/libraries/Omeka/Record/AbstractRecord.php(277): call_user_func(Array, Array)
#16 /var/www/omeka/application/libraries/Omeka/Record/AbstractRecord.php(550): Omeka_Record_AbstractRecord->runCallbacks('afterSave', Array)
#17 /var/www/omeka/application/libraries/Omeka/Controller/AbstractActionController.php(144): Omeka_Record_AbstractRecord->save(false)
#18 /var/www/omeka/application/controllers/ItemsController.php(149): Omeka_Controller_AbstractActionController->addAction()
#19 /var/www/omeka/application/libraries/Zend/Controller/Action.php(516): ItemsController->addAction()
#20 /var/www/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('addAction')
#21 /var/www/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#22 /var/www/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#23 /var/www/omeka/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#24 /var/www/omeka/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#25 /var/www/omeka/admin/index.php(28): Omeka_Application->run()

Thanks in advance.

It looks like some directories aren't writable by the server. That's a little odd, since Omeka checks that when installing, but it's also possible that permissions on directories have changed.

Go to the files directory and make sure that it, and all subdirectories, are writable by the server. Step 5 here might help