One Command Installer Issue

Hi. I followed the installation steps in \"One Command Installer\". I successfully configured the license. But when I tried to configure the database, I was getting errors. I am attaching the screenshot for reference. Please let me know how to solve it. The error I am getting is as follows: Please ensure your database credentials are valid     Please tell which file type is allowed to be uploaded when filing an issue? Because everytime I try to add a png or jpg file, it gives an error.