Filebeat Error on Widows Machine

How do I troubleshoot the following error?
PS C:\Program Files\Filebeat> .\filebeat.exe -e

2021-07-01T12:20:50.286+0100    ERROR   [syslog]        syslog/input.go:155     Error starting the servererrorlisten tcp 127.0.0.1:9000: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.

Something else is using that port.

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