Booting installer fails on critical error.

I'm trying to turn a dell inspiron 5000 series laptop with an intel i5-4210U, but I'm stuck attempting to boot the installer.

All that happens is that I see the following displayed:

ASSERT [OpenCore] OcAppleRamDiskLib.c(490): (ExtentTable)->ExtentCount > 0

Halting on critical error

After this, startup hangs. Have I setup something wrong on my installer? I've only found one other post about this error, with no resolution.

Trying to boot macOS big Sur recovery.

submitted by /u/queenbiscuit311
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