hello.zip? Visit - www.webseekerz.com/blog/drupal-8-custom-module-development.html In bottom of the article, click on hello.zip, module will download. If you still face the issue, please comment
thank you for your quick answer and for your help. i downloaded your file and compared it with my file, then i realized my error. i put a space before ' : ' in the .info.yml file i removed those spaces and it works now.
