Disk you inserted was not readable on startup

Hello, I recently built a hackintosh for the first time using Opencore. I'm having an issue where every time I boot once I get to the desktop I get an error message that says "the disk you inserted was not readable by this computer." I don't have any usb disks plugged in. The only other drive I have plugged in is a second M2 SSD drive that has not been formatted. I plan on installing Windows 10 on that in the future. Can anyone help figure out what the issue might be. I feel like I've Googled and tried everything.

submitted by /u/United_Drama9923
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