UPnPBridge - ERROR LOADING CONFIG FILE

I get this error each time I try to regenerate the UPnPBridge config file:

Starting Squeeze2upnp: /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins/UPnPBridge/Bin/squeeze2upnp-x86-64 -Z -I -f /var/log/squeezeboxserver/upnpbridge.log -x /var/lib/squeezeboxserver/prefs/upnpbridge.xml
[10:22:44.840271] main:1654 Starting squeeze2upnp version: v1.20.0 (Aug 4 2019 @ 14:54:12)
[10:22:44.840296] main:1662

!!!!!!!!!!!!!!!!!! ERROR LOADING CONFIG FILE !!!!!!!!!!!!!!!!!!!!!

[10:22:44.892006] output_init:623 failed loading FLAC: libFLAC.so.8: cannot open shared object file: No such file or directory
[10:22:44.892104] Start:1421 Binding to 10.20.30.108:49152
[10:25:15.292513] Stop:1442 stopping squeezelite devices ...
[10:25:15.292700] Stop:1446 terminate update thread ...
[10:25:15.292895] Stop:1451 terminate main thread ...
[10:25:15.293106] Stop:1455 stopping UPnP devices ...