CS2007 Exception when calling SiteCacheRefresh

I get the following error when calling the 
SiteCacheRefresh.axd?CacheToRefresh=****ppingManagerCache handler:

[Win32Exception (0x80004005): The handle is invalid]
   System.Diagnostics.EventLog.InternalWriteEvent(UInt32 eventID, UInt16 
category, EventLogEntryType type, String[] strings, Byte[] rawData, String

currentMachineName) +476
   System.Diagnostics.EventLog.WriteEvent(EventInstance instance, Byte[] 
data, Object[] values) +320
   System.Diagnostics.EventLog.WriteEvent(EventInstance instance, Object[]

values) +10
  
Microsoft.CommerceServer.Runtime.SiteCacheRefresh.LogCacherefreshFailure(String

cacheName, Exception ex) +197
  
Microsoft.CommerceServer.Runtime.SiteCacheRefresh.ProcessRequest(HttpContext

context) +199
  
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

+154
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& 
completedSynchronously) +64