How do I fix this “could not determine read mode” error message in Duckstation?

Ok I’m kind of new to Duckstation but whenever I click Start Disc, it gives me the stupid error message “Failed to load CD image ‘D:’: Could not determine read mode. And for those wondering, I am using a computer for this, not a phone. It is my new ASUS F15 laptop (which works excellently with emulation btw) running Windows 11 which I got for my birthday. I connected my external disc drive and inserted a real PS1 disc, click Start Disc and the aforementioned error prevents me from loading off a real PS1 disc. Come on, I want to play my disc games on Duckstation. I mean it works with PCSX2 and there was nothing I needed to do! I inserted a PS2 disc, selected Start Disc and it boots! That loaded up right out the gate without needing to do anything else! But Duckstation, no! How do I fix this issue? Should I reinstall it?