No Concurrent User chart on HTML report (v2.0.0-10)

[kanpizza1150]

Hi everyone! Here's the Configuration.

config:
  target: "my endoint" 
  plugins:
    expect: {}
    metrics-by-endpoint:
      useOnlyRequestNames: true
  phases:
    - arrivalRate: 1
      maxVUsers: 25
      duration: 30
  processor: "./customFile.js"
  ensure:
    maxErrorRate: 5 #percent

I ran

yarn artillery run xxx.yaml -o xxx.json

and then

yarn artillery report xxx.json -o xxx.html

to generate HTML report but there is no Concurrent User chart has been shown.

Is there any configuration I've missed? Or any way to generate the Concurrent User chart?

These are all dependencies installed in the project.

  "dependencies": {
    "artillery": "^2.0.0-10",
    "artillery-plugin-expect": "^2.0.0-3",
    "artillery-plugin-metrics-by-endpoint": "^1.0.2"
  },

Thanks!