I see the following in the logs
Resource [Host:44] is unreachable: Host 44: Unable to send commands to virtual router
Can you please check the status of the host with id=44? You can do "select status from cloud.host where id=44". Seems like the host is not Up and CloudPlatform is unable to send command to Virtual router running on that host.
To resolve the issue, make sure the host is Up in cloudplatform or you can delete the Virtual router associated with this network and then proceed with deleting the network itself.