Help! An error occurred while preparing the installation

Sorry for the blurry image… I have an old late 2012 Mac mini I was getting fired up for my son to use and created the USB as described online. I erased the hard drive during the install process as the YouTube video I watched recommended this was the cleanest install…. Now all I get is this error and I’ve no idea what to do. I can’t even go back to the old OS now either 🤦‍♂️

Any tips would be greatly appreciated. I’m not very technical with these things but can follow instructions well 🤣🤣