NullPointerException In Blog.EnablePanelsConfigurationClass

The WARN message is in `YYYY_MM_DD.jetty.log`

WARN  llowedValuesDBListQueryBuilder - Failed to evaluate the Velocity code from the query [select doc.fullName from XWikiDocument doc, BaseObject obj where obj.name = doc.fullName and obj.className = 'Blog.BlogClass' and doc.fullName<>'Blog.BlogTemplate' #if(($xwiki.getUserPreference('displayHiddenDocuments') == 0) || ("$!services.user.properties" != '' && !$services.user.properties.displayHiddenDocuments())) and not doc.hidden #end]. Root cause is [NullPointerException: The name of the Velocity template must not be null]. Continuing with the raw query.