Implementing logging in SharePoint 2010 using the SharePoint Guidance library - sharepoint

Question

I tried to use the SharePoint Guidance library and i got this error.
Someone has a answer or propositions?
Thanks
Error is :
One or more error occurred while writing messages into the log.\r\nThe error while writing to the EventLog was:An exception has occurred.
ExceptionType: 'LoggingException'
ExceptionMessage: 'The Category 'Custom Error/DUET' was not found in the diagnostic categories collections.'
StackTrace: ' at Microsoft.Practices.SharePoint.Common.Logging.DiagnosticsService.GetCategory(String categoryName)
at Microsoft.Practices.SharePoint.Common.Logging.DiagnosticsService.LogTrace(String message, Int32 eventId, TraceSeverity severity, String categoryName)
at Microsoft.Practices.SharePoint.Common.Logging.TraceLogger.Trace(String message, Int32 eventId, TraceSeverity severity, String category)
at Microsoft.Practices.SharePoint.Common.Logging.SharePointLogger.WriteToDeveloperTrace(String message, Int32 eventId, TraceSeverity severity, String category)'
Source: 'Microsoft.Practices.SharePoint.Common'
TargetSite: 'Microsoft.SharePoint.Administration.SPDiagnosticsCategory GetCategory(System.String)'
\r\n Orginal logged message was: An error occurred while writing tot the Trace Log, trace message:kaka Error in Constant recovery
ExceptionType: 'Exception'
ExceptionMessage: 'testing sohail'
StackTrace: ''
Source: ''
TargetSite: ''

Answer 1

What the others have said is correct. You will want to create and register your category when you deploy your code onto your sharepoint environment. I created my logging by doing the following:
I created a farm solution that would deploy all the logging logic on the farm
On the feature activation code, I checked to see if my logging category existed. If not, I create it
When I remove my solution, I deleted my custom category (this is optional)
Here's a link that describes how to created and register your category:
http://msmvps.com/blogs/sundar_narasiman/archive/2012/06/20/how-to-implement-logging-in-sharepoint-2010-part-2.aspx