Omeka has encountered an error

Zend_Loader_PluginLoader_Exception

Plugin by name 'SearchForm' was not found in the registry; used paths:
DocsViewer_View_Helper_: /home/fab/public_html/archives/plugins/DocsViewer/views/helpers/
Coins_View_Helper_: /home/fab/public_html/archives/plugins/Coins/views/helpers/
Omeka_View_Helper_: /home/fab/public_html/archives/application/views/helpers/
Zend_View_Helper_Navigation_: Zend/View/Helper/Navigation/
Zend_View_Helper_: Zend/View/Helper/

exception 'Zend_Loader_PluginLoader_Exception' with message 'Plugin by name 'SearchForm' was not found in the registry; used paths:
DocsViewer_View_Helper_: /home/fab/public_html/archives/plugins/DocsViewer/views/helpers/
Coins_View_Helper_: /home/fab/public_html/archives/plugins/Coins/views/helpers/
Omeka_View_Helper_: /home/fab/public_html/archives/application/views/helpers/
Zend_View_Helper_Navigation_: Zend/View/Helper/Navigation/
Zend_View_Helper_: Zend/View/Helper/' in /home/fab/public_html/archives/application/libraries/Zend/Loader/PluginLoader.php:424
Stack trace:
#0 /home/fab/public_html/archives/application/libraries/Zend/View/Abstract.php(1182): Zend_Loader_PluginLoader->load('SearchForm')
#1 /home/fab/public_html/archives/application/libraries/Zend/View/Abstract.php(618): Zend_View_Abstract->_getPlugin('helper', 'searchForm')
#2 /home/fab/public_html/archives/application/libraries/Zend/View/Abstract.php(344): Zend_View_Abstract->getHelper('searchForm')
#3 /home/fab/public_html/archives/application/libraries/globals.php(1506): Zend_View_Abstract->__call('searchForm', Array)
#4 /home/fab/public_html/archives/application/libraries/globals.php(1506): Omeka_View->searchForm(Array)
#5 /home/fab/public_html/archives/themes/deco/common/header.php(96): search_form()
#6 /home/fab/public_html/archives/application/libraries/Omeka/View.php(117): include('/home/fab/publi...')
#7 /home/fab/public_html/archives/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/home/fab/publi...')
#8 /home/fab/public_html/archives/application/libraries/Zend/View/Helper/Partial.php(109): Zend_View_Abstract->render('common/header.p...')
#9 [internal function]: Zend_View_Helper_Partial->partial('common/header.p...', Array)
#10 /home/fab/public_html/archives/application/libraries/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#11 /home/fab/public_html/archives/application/libraries/globals.php(1661): Zend_View_Abstract->__call('partial', Array)
#12 /home/fab/public_html/archives/application/libraries/globals.php(1661): Omeka_View->partial('common/header.p...', Array)
#13 /home/fab/public_html/archives/application/libraries/globals.php(1675): common('header', Array)
#14 /home/fab/public_html/archives/themes/deco/index.php(1): head(Array)
#15 /home/fab/public_html/archives/application/libraries/Omeka/View.php(117): include('/home/fab/publi...')
#16 /home/fab/public_html/archives/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/home/fab/publi...')
#17 /home/fab/public_html/archives/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render('index.php')
#18 /home/fab/public_html/archives/application/controllers/IndexController.php(16): Zend_Controller_Action_Helper_ViewRenderer->renderScript('index.php')
#19 /home/fab/public_html/archives/application/libraries/Zend/Controller/Action.php(516): IndexController->indexAction()
#20 /home/fab/public_html/archives/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('indexAction')
#21 /home/fab/public_html/archives/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#22 /home/fab/public_html/archives/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#23 /home/fab/public_html/archives/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#24 /home/fab/public_html/archives/application/libraries/Omeka/Application.php(77): Zend_Application->run()
#25 /home/fab/public_html/archives/index.php(23): Omeka_Application->run()
#26 {main}