Can't login via Wordpress Toolkit

Hi @ALL, I added a new domain account and installed WordPress successfully on that domain. But I can't log into the WP Dashboard via the blue login button of Softaculous. Getting the error message: File not found. I have successfully checked with the file manager that the WP installation is present on the server. What might be the reason? I have several other WP installation on this server and I can log into these with no problems.