EOPNOTSUPP error at bpf_perf_event_output function

I'm trying to make the c-based eBPF program.

I attach the kprobe on bio_endio function.
Then I tried to pass my structure to user space.
(I follow the samples/bpf/trace_output example.)

but bpf_perf_event_output returns -EOPNOTSUPP Error.

> bpf_perf_event_output(ctx, &result_map, 0, &result, sizeof(result);

result structure consists of (five u64 var + five u32 var + one char[16]).

> struct bpf_map_def SEC("maps") result_map = {
> .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
> .key_size = sizeof(int),
> .value_size = sizeof(u32),
> .max_entries = 2,
> };

If you know the solution, please help me.

Start with samples/bpf/trace_output and compare its bpf_perf_event_output usage with the kprobe on bio_endio, the result_map definition, and the reported result structure. Reproduce the -EOPNOTSUPP return and determine what differs in the program or context; done means the structure is passed to user space without that error.

Written by the indexing model from the issue text.