cannot open dashboard and console error shows 'the server responded with a MIME type of "text/plain".'

[LeiYangGH]

Prerequisites

• I am using the latest version of Locust
• I am reporting a bug, not asking a question

Description

i'm newbie and trying the hellow world from doc

PS C:\Users\LeiYang> D:\pv\loc\Scripts\Activate.ps1
(loc) PS C:\Users\LeiYang> locust -V
locust 2.24.0 from d:\pv\loc\lib\site-packages\locust (python 3.8.3)
(loc) PS C:\Users\LeiYang> cd D:\G\lucust-learn
(loc) PS D:\G\lucust-learn> locust -f .\demo.py
[2024-03-13 22:41:04,777] DESKTOP-1SLBP5D/WARNING/locust.main: Python 3.8 support is deprecated and will be removed soon
[2024-03-13 22:41:04,777] DESKTOP-1SLBP5D/INFO/locust.main: Starting web interface at http://localhost:8089 (accepting connections from all network interfaces)
[2024-03-13 22:41:04,816] DESKTOP-1SLBP5D/INFO/locust.main: Starting Locust 2.24.0

then i open above web page using either edge or chrome, both blank page, and console error is

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec.

Command line

locust -f .\demo.py

Locustfile contents

from locust import HttpUser, task

class HelloWorldUser(HttpUser):
    @task
    def hello_world(self):
        self.client.get("/hello")
        self.client.get("/world")

Python version

3.8

Locust version

2.24.0

Operating system

windows 11

[LeiYangGH]

duplicate.