Cannot start repomaker on debian using flatpak

Hi, i wanted to create my own repository but I have some problem with installing repomaker via flatpak. The problem is that when I install repomaker via $ flatpak remote-add --if-not-exists flathub ``https://flathub.org/repo/flathub.flatpakrepo, $ flatpak install flathub org.fdroid.Repomaker installation goes fine.. but when I try to start repomaker it says error: Could not connect: No such file or directory. I tried uninstalling and reinstalling it and nothing. By the way I am using Debian on WSL. The screenshot was taken after the installation sorry. I'd be grateful for any response, Lukas.