how to resolve error below for xdp_prog_kern_02.c?

[kolinfluence]

for xdp_prog_kern_02.c
xdp-tutorial/packet-solutions/

how to resolve error below?

libbpf: Error loading .BTF into kernel: -22.
libbpf: Program 'xdp_patch_ports' contains unrecognized relo data pointing to section 9
ERR: loading BPF-OBJ file(xdp_prog_kern_02.o) (-2): No such file or directory
ERR: loading file: xdp_prog_kern_02.o
root@ip-172-26-11-38:/home/ubuntu# ./xdp_loader -d eth0 -A --filename xdp_prog_kern_02.o --progsec xdp_pass

[lmb]

This is not the right venue for help with libbpf or the xdp-tutorial, sorry.