How to decode file encoded by opusenc

[linnv]

There is a file which is encoded by opusenc --raw-rate 16000 nowavheader-stereo.pcm nowavheader-stereo.opus

i can decode it using opusdec --rate 16000 nowavheader-stereo.opus nowavheader-stereo.opus.pcm,

I've tried these code

	opusbs, err := os.ReadFile("./nowavheader-stereo.opus")
	if err != nil {
		panic(err.Error())
	}
	decoder := opus.NewDecoder()
	out := make([]byte, 1920)
	bandwidth, isStereo, err := decoder.Decode(opusbs, out)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("bandwidth: %+v, isStereo: %+v\n", bandwidth, isStereo)
	_ = decoder

but I got this error
panic: unsupported frame code: 3

file is bellow:
MD5 (nowavheader-stereo.pcm) = 9b5ba9b8bc5b96c8055d93033553184c MD5 (nowavheader-stereo.opus) = 13e606dfa6545c9b51a85a30cef2ab6f

opusenc --version
opusenc opus-tools 0.2 (using libopus 1.5.2) Copyright (C) 2008-2018 Xiph.Org Foundation

how to decode it using this package,any example please?
Archive.zip