Cannot install Debian on 3 ISOs, after installing from 2 other discs constantly prompts to insert disc 1, even if it is already inserted

[anonymous7002]

I was installing Debian from 3 ISO images. Debian installer scanned all the discs, and at some point, it told me to insert 2 other discs. Then it prompted to insert disc 1 again, and that's where the problems began. I inserted disc 1, and it prompted me to insert it over and over again, even though the disc was in the virtual drive. It didn't recognize the disc. When I pressed return button, it said "Cannot read from disc" when I continued to installing GRUB. When the installation ended, I tried to boot Debian, and it didn't boot. I have checked the ISO images, and there was nothing wrong with them.