Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\"" module=libcontainerd namespace=plugins.moby`

Can someone explain what the following error in/var/log/syslog means? I don't know if I picked the relevant part, there is a lot more information in the log. Feb 4 10:57:51 chriad-VirtualBox dockerd: time="2019-02-04T10:57:51.039077089+01:00" level=warning msg="grpc: addrConn.createTransport failed to connect to {unix:///run/containerd/containerd.sock 0 }. Err :connection error: desc = \"transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\". Reconnecting..." module=grpc Feb 4 10:57:51 chriad-VirtualBox dockerd: time="2019-02-04T10:57:51.039751889+01:00" level=warning msg="grpc: addrConn.createTransport failed to connect to {unix:///run/containerd/containerd.sock 0 }. Err :connection error: desc = \"transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\". Reconnecting..." module=grpc Feb 4 10:57:51 chriad-VirtualBox dockerd: time="2019-02-04T10:57:51.039822044+01:00" level=error msg="failed to get event" error="rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection error: desc = \"transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused\"" module=libcontainerd namespace=plugins.moby and this goes on for a long time... What can I do to make this error go away? uname -a Linux chriad-VirtualBox 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux` I use virtualbox 5.2.26. systemctl | grep failed ● apport-autoreport.service loaded failed failed Process error reports when automatic reporting is enabled ● containerd.service loaded failed failed containerd container runtime ● vboxadd-service.service loaded failed failed vboxadd-service.service