WCF exception PlainXmlWriter+MaxSizeExceededException

When logging and tracing are switched on for a WCF service, the following exception might be thrown

A message was not logged.
Exception: System.InvalidOperationException: There was an error generating the XML document. ---> System.ServiceModel.Diagnostics.PlainXmlWriter+MaxSizeExceededException: Exception of type 'System.ServiceModel.Diagnostics.PlainXmlWriter+MaxSizeExceededException' was thrown.

The reason is that the maxSizeOfMessageToLog configuration parameter is set to a value that is lower than the size of the message that was trying to be logged.

<system.servicemodel>
<diagnostics>
<messagelogging logentiremessage="true" logmalformedmessages="true" logmessagesatservicelevel="true" logmessagesattransportlevel="true" maxmessagestolog="30000" maxSizeOfMessageToLog="200000">
</diagnostics>
</system.servicemodel>

And while on the subject, it can be worth checking out the MSDN recommended settings for tracing and message logging at http://msdn.microsoft.com/en-us/library/aa702726.aspx.