something about logfile

[MrMix2016]

i can create log file successfully,but no word in my logfile,am i missing something and create an Exception file 2017-01-17 13:16:13.5211 Error Error has been raised. Exception: System.TypeInitializationException: The type initializer for 'NLog.Internal.PlatformDetector' threw an exception. ---> System.MissingMethodException: Method not found: 'Microsoft.Extensions.PlatformAbstractions.RuntimeEnvironment Microsoft.Extensions.PlatformAbstractions.PlatformServices.get_Runtime()'. at NLog.Internal.PlatformDetector.GetCurrentRuntimeOS() at NLog.Internal.PlatformDetector..cctor() --- End of inner exception stack trace --- at NLog.Internal.PlatformDetector.get_CurrentOS() at NLog.Internal.FileAppenders.BaseFileAppender.TryCreateFileStream(Boolean allowFileSharedWriting) at NLog.Internal.FileAppenders.BaseFileAppender.CreateFileStream(Boolean allowFileSharedWriting) at NLog.Internal.FileAppenders.RetryingMultiProcessFileAppender.Write(Byte[] bytes) at NLog.Targets.FileTarget.WriteToFile(String fileName, LogEventInfo logEvent, Byte[] bytes, Boolean justData) at NLog.Targets.FileTarget.ProcessLogEvent(LogEventInfo logEvent, String fileName, Byte[] bytesToWrite) at NLog.Targets.FileTarget.Write(LogEventInfo logEvent) at NLog.Targets.Target.Write(AsyncLogEventInfo logEvent)

[linezero]

Nlog updates to the latest version.