How i will write in log in enterprise library 5.0 in daily basises

Hi I have to write log daily basis and i also added in web Config

add name="Rolling Flat File Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging

listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.RollingFlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging

fileName="D\Log\exception.log

formatter="Text Formatter

rollFileExistsBehavior="Increment" rollInterval="Midnight" rollSizeKB="20

timeStampPattern="yyyy-MM-dd" maxArchivedFiles="3" traceOutputOptions="None

filter="All"

and Cs file i write

Logger.Write("Informational message", "EventLog"

, 2, 100);

When I am running the file than "Activation error occured while trying to get instance of type LogWriter, key """

Pls Solve this Problem or tell me step by step...