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