Hi, i have this error and i don't know from where it come

Error details:Type:ExceptionMessage:Class BASE_CMP_CustomHtml does not existFile:C:\Ampps\www\ow_system_plugins\base\components\drag_and_drop_item.phpLine:207Trace:#0 C:\Ampps\www\ow_system_plugins\base\components\drag_and_drop_item.php(207): ReflectionClass->__construct('BASE_CMP_Custom...') #1 C:\Ampps\www\ow_system_plugins\base\components\drag_and_drop_item.php(92): BASE_CMP_DragAndDropItem->checkComponent('BASE_CMP_Custom...') #2 C:\Ampps\www\ow_system_plugins\base\components\drag_and_drop_entity_panel.php(200): BASE_CMP_DragAndDropItem->setContentComponentClass('BASE_CMP_Custom...') #3 C:\Ampps\www\ow_smarty\template_c\4e7a8325ee1f688eeea0f01f8b4c0c66f3ef07e0.file.drag_and_drop_entity_panel.html.php(102): BASE_CMP_DragAndDropEntityPanel->tplComponent(Array, Object(Smarty_Internal_Template)) #4 C:\Ampps\www\ow_libraries\smarty3\sysplugins\smarty_internal_templatebase.php(180): content_5495913d7b69b7_56009744(Object(Smarty_Internal_Template)) #5 C:\Ampps\www\ow_core\view_renderer.php(101): Smarty_Internal_TemplateBase->fetch('C:\Ampps\www\ow...') #6 C:\Ampps\www\ow_core\renderable.php(263): OW_ViewRenderer->renderTemplate('C:\Ampps\www\ow...') #7 C:\Ampps\www\ow_core\component.php(80): OW_Renderable->render() #8 C:\Ampps\www\ow_system_plugins\base\controllers\component_panel.php(156): OW_Component->render() #9 C:\Ampps\www\ow_system_plugins\base\controllers\component_panel.php(182): BASE_CTRL_ComponentPanel->action('dashboard', 1, false, Array, 'drag_and_drop_e...') #10 [internal function]: BASE_CTRL_ComponentPanel->dashboard(Array) #11 C:\Ampps\www\ow_core\request_handler.php(263): call_user_func_array(Array, Array) #12 C:\Ampps\www\ow_core\application.php(327): OW_RequestHandler->dispatch() #13 C:\Ampps\www\index.php(73): OW_Application->handleRequest() #14 {main}

nothing change even when i cancel all my modifications

any one can help me ?