kind launched as follows:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 80b238c9e4b0 kindest/node:v1.15.0 "/usr/local/bin/entr…" 17 hours ago Up 17 hours 58543/tcp, 127.0.0.1:58543->6443/tcp kind-control-plane

What happened:
When I tried to run kind delete cluster, it shows
Deleting cluster "kind" ... $KUBECONFIG is still set to use /Users/quan.yang/.kube/kind-config-kind even though that file has been deleted, remember to unset it Error: failed to delete cluster: exit status 1

What you expected to happen:
Stop running kind docker

How to reproduce it (as minimally and precisely as possible):
1- Start kind
2- Create Service Account
3- Create ClusterRoleBinding
4- Bearer Token
5- Sign in with Token from UI Dashboard
6- Sign out
7- Type kind delete cluster from CLI

Anything else we need to know?:
Even couldn't stop docker container kind-control-plane with docker stop command

Environment:

• kind version: (use kind version):
  v0.4.0
• Kubernetes version: (use kubectl version):
  Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-20T04:49:16Z", GoVersion:"go1.12.6", Compiler:"gc", Platform:"darwin/amd64"}
• Docker version: (use docker info):
  Docker Desktop Version 2.0.0.3 (31259)
• OS (e.g. from /etc/os-release):
  MacOS version 10.14.5