Issue: Class 'WidgetFramework_WidgetRenderer_Base' not found

Error Info
ErrorException: Fatal Error: Class 'WidgetFramework_WidgetRenderer_Base' not found - library/vw/WidgetFramework/WidgetRenderer/v26.php:3
Generated By: alfa, A moment ago

Stack Trace
#0 [internal function]: XenForo_Application::handleFatalError()
#1 {main}
Request State
array(3) {
  ["url"] => string(331) "https://site.com/admin.php?widgets/add&widget_page_id=565&position=hook:wf_widget_page_contents&group_join=40&conditionalParams={"widgetPage":{"node_id":565}}&_layoutEditor=1&&_xfRequestUri=/&_xfNoRedirect=1&_xfToken=1,1460737520,d71ca88c073838fed1ed2f807d684d1ddebdff56&_xfResponseType=json"
  ["_GET"] => array(10) {
  ["widgets/add"] => string(0) ""
  ["widget_page_id"] => string(3) "565"
  ["position"] => string(28) "hook:wf_widget_page_contents"
  ["group_join"] => string(2) "40"
  ["conditionalParams"] => string(30) "{"widgetPage":{"node_id":565}}"
  ["_layoutEditor"] => string(1) "1"
  ["_xfRequestUri"] => string(1) "/"
  ["_xfNoRedirect"] => string(1) "1"
  ["_xfToken"] => string(53) "1,1460737520,d71ca88c073838fed1ed2f807d684d1ddebdff56"
  ["_xfResponseType"] => string(4) "json"
  }
  ["_POST"] => array(0) {
  }
}