Delete kubernetes cluster failed

[tuanhoangth1603]

Hello,
I created a K8S cluster named "traefik". Then, I created an instance that uses the network of the K8S cluster.
Now, I am unable to delete the K8S cluster and receive an error message on the dashboard:

Network : traefik-network for Kubernetes cluster : traefik has instances using it which are not part of the Kubernetes cluster

Even when I have removed the NIC card from the instance, I still cannot delete the cluster.
Please guide me what should I do to delete the cluster ?
Thanks !
Here is log of delete action:

2023-05-13 19:06:01,561 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (qtp1443435931-3581:ctx-c5b747ae ctx-ba237f8a) (logid:5cd97356) submit async job-2440, details: AsyncJobVO: {id:2440, userId: 2, accountId: 2, instanceType: None, instanceId: null, cmd: org.apache.cloudstack.api.command.user.kubernetes.cluster.DeleteKubernetesClusterCmd, cmdInfo: {"response":"json","ctxUserId":"2","httpmethod":"GET","ctxStartEventId":"14461","id":"fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc","ctxDetails":"{\"interface com.cloud.kubernetes.cluster.KubernetesCluster\":\"fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc\"}","ctxAccountId":"2","uuid":"fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc","cmdEventType":"KUBERNETES.CLUSTER.DELETE"}, cmdVersion: 0, status: IN_PROGRESS, processStatus: 0, resultCode: 0, result: null, initMsid: 2486689901113, completeMsid: null, lastUpdated: null, lastPolled: null, created: null, removed: null}
2023-05-13 19:06:01,563 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (API-Job-Executor-8:ctx-7fcdc023 job-2440) (logid:a74992c9) Executing AsyncJobVO: {id:2440, userId: 2, accountId: 2, instanceType: None, instanceId: null, cmd: org.apache.cloudstack.api.command.user.kubernetes.cluster.DeleteKubernetesClusterCmd, cmdInfo: {"response":"json","ctxUserId":"2","httpmethod":"GET","ctxStartEventId":"14461","id":"fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc","ctxDetails":"{\"interface com.cloud.kubernetes.cluster.KubernetesCluster\":\"fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc\"}","ctxAccountId":"2","uuid":"fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc","cmdEventType":"KUBERNETES.CLUSTER.DELETE"}, cmdVersion: 0, status: IN_PROGRESS, processStatus: 0, resultCode: 0, result: null, initMsid: 2486689901113, completeMsid: null, lastUpdated: null, lastPolled: null, created: null, removed: null}
2023-05-13 19:06:01,565 DEBUG [c.c.a.ApiServlet] (qtp1443435931-3581:ctx-c5b747ae ctx-ba237f8a) (logid:5cd97356) ===END===  103.149.172.101 -- GET  id=fe5b759c-78a4-4a0e-b5c2-5e2d861df4fc&command=deleteKubernetesCluster&response=json
2023-05-13 19:06:01,598 ERROR [c.c.k.c.a.KubernetesClusterActionWorker] (API-Job-Executor-8:ctx-7fcdc023 job-2440 ctx-13a975a9) (logid:a74992c9) Network : traefik-network for Kubernetes cluster : traefik has instances using it which are not part of the Kubernetes cluster
2023-05-13 19:06:01,599 INFO  [c.c.k.c.a.KubernetesClusterActionWorker] (API-Job-Executor-8:ctx-7fcdc023 job-2440 ctx-13a975a9) (logid:a74992c9) Revoking launch permission for systemVM template
2023-05-13 19:06:01,606 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (API-Job-Executor-8:ctx-7fcdc023 job-2440) (logid:a74992c9) Complete async job-2440, jobStatus: FAILED, resultCode: 530, result: org.apache.cloudstack.api.response.ExceptionResponse/null/{"uuidList":[],"errorcode":"530","errortext":"Network : traefik-network for Kubernetes cluster : traefik has instances using it which are not part of the Kubernetes cluster"}
2023-05-13 19:06:01,621 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (API-Job-Executor-8:ctx-7fcdc023 job-2440) (logid:a74992c9) Done executing org.apache.cloudstack.api.command.user.kubernetes.cluster.DeleteKubernetesClusterCmd for job-2440

And this is a list of instances on the network

[tuanhoangth1603]

Need to delete the instance.