NLog target cannot be found

[Lloyd Kinsella]

I'm having issues today with an NLog configuration that previously worked. My `NLog.config` looks something like this:

    <?xml version="1.0" encoding="utf-8" ?>
    <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   
      <extensions>
        <add assembly="StudyGroup.Logging.NLog" />
      </extensions>
   
      <targets>
        <target xsi:type="StudyGroup" name="StudyGroup" enabled="false" product="SalesForce (Uploader)" application="Application" />
   
        <target xsi:type="ColoredConsole" name="Console" layout="${message} ${exception:format=ToString}" />
   
      </targets>
   
      <rules>
        <logger name="*" writeTo="Console,StudyGroup" minlevel="Debug" />
      </rules>
    </nlog>

However all of a sudden I'm getting this exception thrown:

    Unhandled Exception: System.TypeInitializationException: The type initializer fo

    r 'SalesForce.Uploader.UploaderService' threw an exception. ---> NLog.NLogConfig

    urationException: Exception occurred when loading configuration from D:\Services

    \SalesForceUploader\NLog.config ---> System.ArgumentException: Target cannot be

    found: 'StudyGroup'

       at NLog.Config.Factory`2.CreateInstance(String name)

       at NLog.Config.XmlLoggingConfiguration.ParseTargetsElement(NLogXmlElement tar

    getsElement)

       at NLog.Config.XmlLoggingConfiguration.ParseNLogElement(NLogXmlElement nlogEl

    ement, String baseDirectory)

       at NLog.Config.XmlLoggingConfiguration.Initialize(XmlReader reader, String fi

    leName, Boolean ignoreErrors)

       --- End of inner exception stack trace ---

       at NLog.Config.XmlLoggingConfiguration.Initialize(XmlReader reader, String fi

    leName, Boolean ignoreErrors)

       at NLog.Config.XmlLoggingConfiguration..ctor(String fileName)

       at NLog.LogFactory.get_Configuration()

       at NLog.LogFactory.GetLogger(LoggerCacheKey cacheKey)

       at NLog.LogManager.GetCurrentClassLogger()

       at SalesForce.Uploader.UploaderService..cctor()

       --- End of inner exception stack trace ---

       at SalesForce.Uploader.UploaderService.Main(String[] args)

And I can't figure why. This used to work and still does in other projects except this one. I know for sure StudyGroup.Logging.NLog contains my target class, properly attributes etc.

Anyone any thoughts on what's going on?

[Lloyd Kinsella]

Resolved it. NLog version mismatch it seems between my assemblies and the application.

[Kim Christensen]

Glad you figured this out