in event viewer

administrative event it is showing

An error occurred while writing a trace event to the file, \\?\C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Log\FlightRecorderCurrent.trc.

An error occurred while closing the trace output file, \\?\C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Log\FlightRecorderCurrent.trc.