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@Gordon
The issue is probably that the SDIO driver is designed for the STM32F1 parts, and you're trying to use in on an STM32F4. You could try and change the code so that it would handle STM32F4 too, but that might be quite hard work.
Otherwise as @DrAzzy says, I'll be including the ability to use the SD card on any pins. It won't be SDIO (in fact it'll just be software SPI if you haven't got the SD card connected to a hardware SPI port), but it should work well enough.