Why I use calico in kubernetes, but still kubelet try to look for flannel?

[Broadroad]

I use calico in my cluster , and everything seems ok. But when I create new pod here, kubelet try to look for flannel. It is wired.

NAME                                       READY     STATUS    RESTARTS   AGE
calico-kube-controllers-1748576524-h772q   1/1       Running   0          1h
calico-node-6rkb9                          2/2       Running   14         1h
calico-node-c4rzm                          2/2       Running   15         1h
calico-node-vpf0g                          2/2       Running   16         1h

936 reflector.go:323] k8s.io/kubernetes/pkg/kubelet/kubelet.go:382: watch of *v1.Service ended with: very short watc
1023 03:32:46.529178   19936 cni.go:257] Error adding network: open /run/flannel/subnet.env: no such file or directory
1023 03:32:46.529227   19936 cni.go:211] Error while adding to cni network: open /run/flannel/subnet.env: no such file or directory
1023 03:32:46.630566   19936 remote_runtime.go:86] RunPodSandbox from runtime service failed: rpc error: code = 2 desc = NetworkPlugin cni fa
1023 03:32:46.630846   19936 kuberuntime_sandbox.go:54] CreatePodSandbox for pod "busybox_default(45de94b8-b79f-11e7-b206-0050569f4fcf)" fail
1023 03:32:46.630896   19936 kuberuntime_manager.go:619] createPodSandbox for pod "busybox_default(45de94b8-b79f-11e7-b206-0050569f4fcf)" fai
1023 03:32:46.630989   19936 pod_workers.go:182] Error syncing pod 45de94b8-b79f-11e7-b206-0050569f4fcf ("busybox_default(45de94b8-b79f-11e7-
1023 03:32:46.817663   19936 docker_sandbox.go:263] NetworkPlugin cni failed on the status hook for pod "busybox_default": Unexpected command
with error: exit status 1
1023 03:32:46.856827   19936 docker_sandbox.go:263] NetworkPlugin cni failed on the status hook for pod "busybox_default": Unexpected command
with error: exit status 1
1023 03:32:46.892439   19936 docker_sandbox.go:263] NetworkPlugin cni failed on the status hook for pod "busybox_default": Unexpected command

with error: exit status 1

Calico process is running.

IPv4 BGP status
+---------------+-------------------+-------+----------+-------------+
| PEER ADDRESS  |     PEER TYPE     | STATE |  SINCE   |    INFO     |
+---------------+-------------------+-------+----------+-------------+
| 10.247.99.136 | node-to-node mesh | up    | 02:38:46 | Established |
| 10.247.99.138 | node-to-node mesh | up    | 02:39:47 | Established |
+---------------+-------------------+-------+----------+-------------+

And my kubelet.service like this:

Environment=KUBELET_IMAGE_TAG=v1.6.1_coreos.0
Environment="RKT_RUN_ARGS=--insecure-options=all \
  --volume cni-bin,kind=host,source=/opt/cni/bin \
  --mount volume=cni-bin,target=/opt/cni/bin"
ExecStartPre=/usr/bin/mkdir -p /etc/kubernetes/manifests
ExecStartPre=/usr/bin/mkdir -p /var/log/containers
ExecStart=/usr/lib/coreos/kubelet-wrapper \
  --api-servers=http://$hostip:4432 \
  --register-node=true \
  --container-runtime=docker \
  --allow-privileged=true \
  --pod-manifest-path=/etc/kubernetes/manifests \
  --hostname-override=$hostip \
  --cluster_dns=10.3.0.10 \
  --cni-conf-dir=/etc/cni/net.d \
  --network-plugin=cni \
  --cluster_domain=cluster.local
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target
EOF

When I install calico, I use this link:
https://docs.projectcalico.org/v2.6/getting-started/kubernetes/installation/hosted/hosted

Did I miss something?