Unable to connect to the server is displayed in kubernetes

When I tried to use docker desktop kubernetes in accordance with the reference book on a Windows 10 pro machine, the following error occurred in the command kubetcl cluster-info.

Unable to connect to the server:Service Unavailable

kubectl config view results were as follows:

 apiVersion:v1
clusters:
- cluster:
    certificate-authority-data —DATA+OMITTED
    server:https://kubernetes.docker.internal:6443
  name —docker-desktop
contexts:
- context:
    cluster —docker-desktop
    user —docker-desktop
  name —docker-desktop
- context:
    cluster —docker-desktop
    user —docker-desktop
  name —docker-for-desktop
current-context —docker-desktop
kind—Config
preferences:{}
users:
- name —docker-desktop
  user:
    client-certificate-data —REDACTED
    client-key-data —REDACTED

I searched online and tried the following, but it didn't work.

• Delete docker images, containers, and volumes to free up space

• Adjust Resource

  • CPUs:7
  • Memory: 18.50 GB
  • Swap: 4GB
  • Disk image size 128GB (54.9GB used)

• Specify cluster server in kubectl config

  • kubectl config set-cluster docker-desktop
    --server=https://[IPADDR]:[PORT]

• Restart Docker Desktop

Remove docker images, containers, and volumes to free up space

Adjust Resource

• CPUs:7
• Memory: 18.50 GB
• Swap: 4GB
• Disk image size 128GB (54.9GB used)

Specify cluster server in kubectl config

• kubectl config set-cluster docker-desktop
  --server=https://[IPADDR]:[PORT]

Restart Docker Desktop

I use docker desktop on Windows 10 pro.

The versions are as follows:

• docker desktop community: 2.2.0.5
• Docker Engine: 19.03.8
• Notary: 0.6.1
• Compose: 1.25.4
• Credential Helper: 0.6.3
• Kubernetes:1.15.5

Once this problem has been resolved, we are thinking of moving nginx in the manifest file in the next step.

I can't find a solution by myself, so I wrote it here to ask for your advice.
If you have any missing information, please reply.

Thank you for your cooperation.