CSV Import error opening in admin

We have two instances of Omeka installed on our server, both of which have the CSV Import plugin. The plugin works on one installation but not on the other.
On the less fortunate installation, if we click the CSV Import link on the admin page, the following error is reported:

Zend_Controller_Dispatcher_Exception
Invalid controller specified (csv-import)

Backtrace
exception 'Zend_Controller_Dispatcher_Exception' with message 'Invalid controller specified (csv-import)' in /home/history/public_html/projects/ncsuhistory/nceats/application/libraries/Zend/Controller/Dispatcher/Standard.php:248
Stack trace:
#0 /home/history/public_html/projects/ncsuhistory/nceats/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /home/history/public_html/projects/ncsuhistory/nceats/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#2 /home/history/public_html/projects/ncsuhistory/nceats/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#3 /home/history/public_html/projects/ncsuhistory/nceats/application/libraries/Omeka/Core.php(166): Zend_Application->run()
#4 /home/history/public_html/projects/ncsuhistory/nceats/admin/index.php(45): Omeka_Core->run()
#5 {main}

Any tips?

Make sure the name of the plugin's folder is exactly "CsvImport."

If the name is different, you'll have to uninstall the plugin, change the folder name to be correct (or just unzip a new copy) and re-install.

I have the same problem :s

exception 'Zend_Controller_Dispatcher_Exception' with message 'Invalid controller specified (administrator)' in /home4/historo3/public_html/repositorio/application/libraries/Zend/Controller/Dispatcher/Standard.php:248
Stack trace:
#0 /home4/historo3/public_html/repositorio/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /home4/historo3/public_html/repositorio/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#2 /home4/historo3/public_html/repositorio/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#3 /home4/historo3/public_html/repositorio/application/libraries/Omeka/Core.php(166): Zend_Application->run()
#4 /home4/historo3/public_html/repositorio/index.php(30): Omeka_Core->run()
#5 {main}

?????

What URL are you going to?

The error message you posted suggests that you're using a URL that ends in something like "administrator," but the Omeka admin-side interface is just "admin."