nxlog stopped working

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SB_542377

2020-08-17 16:31:18 INFO nxlog-ce-2.10.2150 started 2020-08-17 16:31:18 ERROR couldn't connect to udp socket on 10.0.20.99:12201; A socket operation was attempted to an unreachable network.

why I am getting this error?How can I solve this?

NXLog-CE version- 2.10.2150