Dropbox Errors whenever Clicking its Tab

I have installed Omeka 1.5.3 via one click install on Dreamhost - using the Encoded Curtain theme & Contribution plugin to gather goodies for our archive.:
http://www.artstash.artrocksathens.com/ARAArt/contribution
I want to use the Dropbox plugin from the back end to upload items I've accumulated via upload forms before using Omeka. I keep getting controller errors when I try. ARGH!
I've tried every trick I could find here. NOTHING works. HELP!

This is the info I get when go to the 'items' tab, click 'add item' after Dropbox is activated, the 'files' folder has write permission '777' and there are files ftp'd into it:

Omeka has encountered an error

UnexpectedValueException
DirectoryIterator::__construct(/home/torchstar/artstash.artrocksathens.com/ARAArt/plugins/Dropbox/files) [directoryiterator.--construct]: failed to open dir: No such file or directory

#0 /home/torchstar/artstash.artrocksathens.com/ARAArt/plugins/Dropbox 2/plugin.php(153): DirectoryIterator->__construct('/home/torchstar...')
#1 /home/torchstar/artstash.artrocksathens.com/ARAArt/plugins/Dropbox 2/views/admin/index/dropboxlist.php(3): dropbox_dir_list('/home/torchstar...')
#2 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Omeka/View.php(113): include('/home/torchstar...')
#3 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/home/torchstar...')
#4 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/View/Helper/Partial.php(105): Zend_View_Abstract->render('index/dropboxli...')
#5 [internal function]: Zend_View_Helper_Partial->partial('index/dropboxli...', Array)
#6 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#7 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/helpers/Functions.php(68): Zend_View_Abstract->__call('partial', Array)
#8 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/helpers/Functions.php(68): Omeka_View->partial('index/dropboxli...', Array)
#9 /home/torchstar/artstash.artrocksathens.com/ARAArt/plugins/Dropbox 2/plugin.php(44): common('dropboxlist', Array, 'index')
#10 /home/torchstar/artstash.artrocksathens.com/ARAArt/plugins/Dropbox 2/plugin.php(54): dropbox_list()
#11 [internal function]: dropbox_items_form_files(Object(Item))
#12 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Omeka/Plugin/Broker.php(156): call_user_func_array('dropbox_items_f...', Array)
#13 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Omeka/Plugin/Broker.php(182): Omeka_Plugin_Broker->callHook('admin_append_to...', Array)
#14 [internal function]: Omeka_Plugin_Broker->__call('admin_append_to...', Array)
#15 [internal function]: Omeka_Plugin_Broker->admin_append_to_items_form_files(Object(Item))
#16 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/globals.php(215): call_user_func_array(Array, Array)
#17 /home/torchstar/artstash.artrocksathens.com/ARAArt/admin/themes/default/items/files-form.php(59): fire_plugin_hook('admin_append_to...', Object(Item))
#18 /home/torchstar/artstash.artrocksathens.com/ARAArt/admin/themes/default/items/form-tabs.php(32): require('/home/torchstar...')
#19 /home/torchstar/artstash.artrocksathens.com/ARAArt/admin/themes/default/items/add.php(6): include('/home/torchstar...')
#20 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Omeka/View.php(113): include('/home/torchstar...')
#21 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/home/torchstar...')
#22 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(900): Zend_View_Abstract->render('items/add.php')
#23 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(921): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/add.php', NULL)
#24 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(960): Zend_Controller_Action_Helper_ViewRenderer->render()
#25 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#26 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#27 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('addAction')
#28 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#29 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#30 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#31 /home/torchstar/artstash.artrocksathens.com/ARAArt/application/libraries/Omeka/Core.php(165): Zend_Application->run()
#32 /home/torchstar/artstash.artrocksathens.com/ARAArt/admin/index.php(44): Omeka_Core->run()
#33 {main}

Holy Cow! I got dropbox to work!! First I 86'd the plugin on the server - uninstalled it. Then I downloaded a fresh copy, deleted every instance of it everywhere on my computer, emptied the trash and restarted…
Then I FTP'd the fresh copy to the plugins folder, detached from the server after changing the permissions on the 'files' folder.
I opened Safari, purged the cache, loaded the Omeka Dashboard, and installed Dropbox again. Weird thing was it was listed twice in the plugins settings! But this time when I clicked the Dropbox tab on the Dashboard I got the happy page, not an error.
I closed the browser - FTP'd some images to Dropbox's 'files' folder, turned detached from the server - then opened a browser window, purged the cache again, opened the Omeka Dashboard, clicked the Dropbox tab…
THE FILES I FTP'd were ALL THERE! And I could edit them without causing any errors!!! OMG.
I don't know what happened before - I had reinstalled this plugin trying to fix the error thing, but this time it worked.