Slim L2R2 dual analog 4ADC add-on issue

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The main issue is shown here in your log.

Your kernel headers for kernel 4.14.98-v7+ cannot be found at
/lib/modules/4.14.98-v7+/build or /lib/modules/4.14.98-v7+/source.

This suggests that you're running kernel 4.14.98-v7+ but the headers are not present.  BUT, the log also shows that the kernel headers were installed, so they're likely from a different kernel.

So, there's a Raspberry Pi thread that says this is the fix.

Code:

sudo umount /boot
sudo mount /dev/mmcblk0p1 /boot
sudo apt install --reinstall raspberrypi-bootloader
sudo reboot

But I don't know if that'll help or not.  You'd likely have to re-run the ./install.sh from the mk_arcade code after doing that.

What's the output you get from this?  On mine, it lists a version for the kernel and the headers.  They're an exact match.  Are they on yours?

Code:

dpkg-query -l raspberrypi-kernel*