kan producten niet meer openen en nieuwe toevoegen

[VFRoland]

kan ineens niet meer toevoegen en aanpassen krijg de volgende melding..

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var/chache is al geleegd en var/session ook...

wat kan dit zijn ??

ik was bezig met installeren en deinstalleren van een new product image slider

[VFRoland]

het is volgens mij fout gegaan na de datum aanpassing in config. catalogus...

[VFRoland]

dit is de melding als ik de code volg...

a:5:{i:0;s:80:"Source model "productslider/source_feature" not found for attribute "is_feature"";i:1;s:3222:"#0 /home/bikersst/public_html/app/code/core/Mage/Eav/Model/Entity/Attribute/Abstract.php(387): Mage::exception('Mage_Eav', 'Source model "p...')
#1 /home/bikersst/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Form.php(201): Mage_Eav_Model_Entity_Attribute_Abstract->getSource()
#2 /home/bikersst/public_html/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Attributes.php(70): Mage_Adminhtml_Block_Widget_Form->_setFieldset(Array, Object(Varien_Data_Form_Element_Fieldset), Array)
#3 /home/bikersst/public_html/app/code/core/Mage/Adminhtml/Block/Widget/Form.php(144): Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Attributes->_prepareForm()
#4 /home/bikersst/public_html/app/code/core/Mage/Core/Block/Abstract.php(918): Mage_Adminhtml_Block_Widget_Form->_beforeToHtml()
#5 /home/bikersst/public_html/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tabs.php(79): Mage_Core_Block_Abstract->toHtml()
#6 /home/bikersst/public_html/app/code/core/Mage/Core/Block/Abstract.php(293): Mage_Adminhtml_Block_Catalog_Product_Edit_Tabs->_prepareLayout()
#7 /home/bikersst/public_html/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#8 /home/bikersst/public_html/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('adminhtml/catal...', 'product_tabs')
#9 /home/bikersst/public_html/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('adminhtml/catal...', 'product_tabs')
#10 /home/bikersst/public_html/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#11 /home/bikersst/public_html/app/code/core/Mage/Core/Model/Layout.php(210): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#12 /home/bikersst/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#13 /home/bikersst/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(269): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#14 /home/bikersst/public_html/app/code/core/Mage/Adminhtml/Controller/Action.php(275): Mage_Core_Controller_Varien_Action->loadLayout(Array, true, true)
#15 /home/bikersst/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php(250): Mage_Adminhtml_Controller_Action->loadLayout(Array)
#16 /home/bikersst/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Adminhtml_Catalog_ProductController->editAction()
#17 /home/bikersst/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('edit')
#18 /home/bikersst/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#19 /home/bikersst/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#20 /home/bikersst/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#21 /home/bikersst/public_html/index.php(83): Mage::run('', 'store')
#22 {main}";s:3:"url";s:82:"/index.php/beheer/catalog_product/edit/id/21/key/0fe5756801e2751320e7b957b331bdab/";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:5:"admin";}

[Puurhost]

Het beste kan je denk ik even een code inhuren om je site door te lopen (of vraag je hoster - als je er eentje hebt die zich richt op Magento hebben die er vaak ook wel ondersteuning bij), met alleen de informatie die je hier plaatst kan ik je ook niet helpen ben ik bang