Cant install geekshop script

Hi. I would like to install the geekshop script but when I go to the folder and install composer I am getting this error: require.voyager-themes is invalid, it should have a vendor name, a forward slash, and a package name. The vendor an d package name can be words separated by -, . or _. The complete name should match "^a-z0-9/a- z0-9$".