Metricbeat fail safe/over function on output

got new error message.

metricbeat stopped.
2018-08-03T11:53:47.570+0800 ERROR instance/beat.go:691 Exiting: error initializing publisher: spool queue: failed to open file at path 'C:\ProgramData\metricbeat/spool.dat': file C:\ProgramData\metricbeat/spool.dat can not be locked right now