title: Exception when executing agent maintenanceService in Sitecore
body: <p>I am utilizing Sitecore 8.0 - Update 4.  </p>
  
  <p>I note the following errors occurring once every minute in my log.2010706.??????.txt log files:</p>
  
  <pre><code>8620 14:46:15 ERROR Exception when executing agent maintenanceService
  Exception: Sitecore.Exceptions.RequiredObjectIsNullException
  Message: Could not find add method: RegisterService (type: Sitecore.Analytics.Core.MaintenanceAgent)
  Source: Sitecore.Kernel
     at Sitecore.Configuration.Factory.AssignProperties(Object obj, Object[] properties)
     at Sitecore.Configuration.Factory.AssignProperties(XmlNode configNode, String[] parameters, Object obj, Boolean assert, Boolean deferred, IFactoryHelper helper)
     at Sitecore.Configuration.Factory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper)
     at Sitecore.Configuration.Factory.CreateObject(String configPath, String[] parameters, Boolean assert)
     at Sitecore.Analytics.Core.BackgroundService.CreateAgent()
     at Sitecore.Analytics.Core.BackgroundService.ExecuteAgent()
     at Sitecore.Analytics.Core.BackgroundService.Run()
  </code></pre>
  
  <p>Does anyone have any ideas as to what could be causing this and how it can be resolved?</p>