title: Activation error occured while trying to get instance of type LogWriter
body: <p>I am trying to using the Logging Application block of Enterprise Library 5.0 to log simple message to the Windows event log on Win XP SP3 system using:</p>
  
  <pre><code>Logger.Write(msg);
  </code></pre>
  
  <p>I get the "Activation error occured while trying to get instance of type LogWriter" error message when trying to log.</p>
  
  <p>Shown below is the config file used with MS Enterprise library</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
  &lt;configuration&gt;
  &lt;configSections&gt;
      &lt;section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" /&gt;
  &lt;/configSections&gt;
  &lt;loggingConfiguration name="" tracingEnabled="true" defaultCategory="General"&gt;
      &lt;listeners&gt;
          &lt;add name="Event Log Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FormattedEventLogTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
              listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FormattedEventLogTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
              source="Enterprise Library Logging" formatter="Text Formatter"
              log="Application" machineName="." traceOutputOptions="None" /&gt;
      &lt;/listeners&gt;
      &lt;formatters&gt;
          &lt;add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.414.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
              template="Timestamp: {timestamp}{newline}&amp;#xA;Message: {message}{newline}&amp;#xA;Category: {category}{newline}&amp;#xA;Priority: {priority}{newline}&amp;#xA;EventId: {eventid}{newline}&amp;#xA;Severity: {severity}{newline}&amp;#xA;Title:{title}{newline}&amp;#xA;Machine: {localMachine}{newline}&amp;#xA;App Domain: {localAppDomain}{newline}&amp;#xA;ProcessId: {localProcessId}{newline}&amp;#xA;Process Name: {localProcessName}{newline}&amp;#xA;Thread Name: {threadName}{newline}&amp;#xA;Win32 ThreadId:{win32ThreadId}{newline}&amp;#xA;Extended Properties: {dictionary({key} - {value}{newline})}"
              name="Text Formatter" /&gt;
      &lt;/formatters&gt;
      &lt;categorySources&gt;
          &lt;add switchValue="All" name="General"&gt;
              &lt;listeners&gt;
                  &lt;add name="Event Log Listener" /&gt;
              &lt;/listeners&gt;
          &lt;/add&gt;
      &lt;/categorySources&gt;
      &lt;specialSources&gt;
          &lt;allEvents switchValue="All" name="All Events" /&gt;
          &lt;notProcessed switchValue="All" name="Unprocessed Category" /&gt;
          &lt;errors switchValue="All" name="Logging Errors &amp;amp; Warnings"&gt;
              &lt;listeners&gt;
                  &lt;add name="Event Log Listener" /&gt;
              &lt;/listeners&gt;
          &lt;/errors&gt;
      &lt;/specialSources&gt;
  &lt;/loggingConfiguration&gt;
  &lt;/configuration&gt;
  </code></pre>