Unity webGl unable to see the main scene

Question

I build an application using Unity 2019.4 So if I try to build this application as windows application it is ok, if I try to build this application as HTML5 application, I can see this when I tun it:

instead of this:

This is the web.config file that I insert in the folder of the application on IIS

<configuration>
  <system.webServer>
    <staticContent>
        
        <mimeMap fileExtension=".mem" mimeType="application/octet-stream" />
    　　　　<mimeMap fileExtension=".unityweb" mimeType="application/octet-stream" />
        <mimeMap fileExtension=".data" mimeType="application/octet-stream" />
　　　　　　  <mimeMap fileExtension=".memgz" mimeType="application/octet-stream" />
　　　　　　  <mimeMap fileExtension=".datagz" mimeType="application/octet-stream" />
　　　　　　  <mimeMap fileExtension=".unity3dgz" mimeType="application/octet-stream" />
　　　　　　  <mimeMap fileExtension=".jsgz" mimeType="application/x-javascript;charset=UTF-8" />
　　　　</staticContent>
    
    <modules runAllManagedModulesForAllRequests="true"></modules>
　　</system.webServer>
</configuration>