What do I need to do to get rid of this error? Please help

[Ramaa Davanagere]

log4net: RollingFileAppender: Searched for existing files in [C:\Program Files\Mobius\contenuity\LogFiles] log4net: RollingFileAppender: curSizeRollBackups starts at [0] log4net: FileAppender: Opening file for writing [C:\Program Files\Mobius\contenuity\LogFiles\vdrconBOLog.txt] append [True] log4net:ERROR [RollingFileAppender] Unable to acquire lock on file C:\Program Files\Mobius\contenuity\LogFiles\vdrconBOLog.txt. The process cannot access the file "C:\Program Files\Mobius\contenuity\LogFiles\vdrconBOLog.txt" because it is being used by another process. log4net:ERROR [RollingFileAppender] OpenFile(C:\Program Files\Mobius\contenuity\LogFiles\vdrconBOLog.txt,True) call failed. LockStateException: The file is not currently locked    at log4net.Appender.LockingStream.AssertLocked()    at log4net.Appender.LockingStream.get_CanWrite()    at System.IO.StreamWriter..ctor(Stream stream, Encoding encoding, Int32 bufferSize)    at System.IO.StreamWriter..ctor(Stream stream, Encoding encoding)    at log4net.Appender.FileAppender.OpenFile(String fileName, Boolean append)    at log4net.Appender.RollingFileAppender.OpenFile(String fileName, Boolean append)    at log4net.Appender.FileAppender.SafeOpenFile(String fileName, Boolean append) log4net: FileAppender: Opening file for writing [C:\Program Files\Mobius\contenuity\LogFiles\vdrconBOLog.txt] append [True]