2-Channel CAN-BUS(FD) Shield for Raspberry Pi (MCP2518FD) not appearing in kernel log

I followed the instructions on: https://wiki.seeedstudio.com/2-Channel-CAN-BUS-FD-Shield-for-Raspberry-Pi/
to set up my CAN Bus shield. After editing the boot/config file and adding the dtoverlay nothing appeared in the kernel log.
I saw a previous question on this topic saying to follow the instructions here (https://github.com/Seeed-Studio/seeed-linux-dtoverlays/tree/master/modules/CAN-HAT) instead, but cannot get past the ./install.sh step without getting an error:

DKMS: add completed.
Error! echo
Your kernel headers for kernel 4.19.97+ cannot be found at
/lib/modules/4.19.97+/build or /lib/modules/4.19.97+/source.
Error! echo
Your kernel headers for kernel 4.19.97-v7+ cannot be found at
/lib/modules/4.19.97-v7+/build or /lib/modules/4.19.97-v7+/source.
Error! echo
Your kernel headers for kernel 4.19.97-v7l+ cannot be found at
/lib/modules/4.19.97-v7l+/build or /lib/modules/4.19.97-v7l+/source.

Any suggestions on how to troubleshoot this problem are greatly appreciated.