Creating a simple page in the admin panel

Hello friends

I am trying to create a simple page for a plugin I wrote so that I can access it through the sidebar of the admin panel, but no matter how hard I tried, I couldn’t

I will leave you the GitHub repo of my plugin codes.

When I enter the plugins page, I encounter this error

Unable to configure link to ‘Verify Requests Plugin’. Ensure ad-blockers are disabled and try reloading the page.

If possible, can you tell me where the problem is and how can I solve this problem???

In addition, the company I work for has forced us to use a DockerCompose that uses the Discourse bitname package, and the Discourse version is 3.5.0. Please guide me if possible.