Panic while handling reactor event

[dsully]

With this code:

{
        exit_chan := make(chan bool)
	reactor := sonos.MakeReactor(SONOS_IFNAME, SONOS_EVENTING_PORT)
	go handleSonosEvent(reactor, exit_chan)
}

func handleSonosEvent(reactor upnp.Reactor, c chan bool) {
	for {
		select {
		case evt := <-reactor.Channel():
			switch evt.Type() {
			case upnp.AVTransport_EventType:
				log.Printf("Got Event!")
                        }
                }
        }
}

This exception is thrown:

panic: reflect.Value.Interface: cannot return value obtained from unexported field or method

goroutine 5 [running]:
panic(0x2958e0, 0xc420324b20)
	/usr/local/Cellar/go/1.7.3/libexec/src/runtime/panic.go:500 +0x1a1
reflect.valueInterface(0x2c1e00, 0xc42020cb90, 0x1d9, 0x1, 0x1, 0xc4203244e0)
	/usr/local/Cellar/go/1.7.3/libexec/src/reflect/value.go:918 +0x1be
reflect.Value.Interface(0x2c1e00, 0xc42020cb90, 0x1d9, 0x1d9, 0x2c1e00)
	/usr/local/Cellar/go/1.7.3/libexec/src/reflect/value.go:907 +0x44
encoding/xml.(*Decoder).unmarshal(0xc4201f3a20, 0x2ffda0, 0xc42020cb90, 0x199, 0xc420356480, 0xc42020cb90, 0x199)
	/usr/local/Cellar/go/1.7.3/libexec/src/encoding/xml/read.go:412 +0x1f5e
encoding/xml.(*Decoder).unmarshalPath(0xc4201f3a20, 0xc420236da0, 0x2c1d60, 0xc42020cb70, 0x199, 0x0, 0x0, 0x0, 0xc420356480, 0x1, ...)
	/usr/local/Cellar/go/1.7.3/libexec/src/encoding/xml/read.go:627 +0x6a9
encoding/xml.(*Decoder).unmarshal(0xc4201f3a20, 0x2c1d60, 0xc42020cb70, 0x199, 0xc420356380, 0x199, 0x2ca2eea3)
	/usr/local/Cellar/go/1.7.3/libexec/src/encoding/xml/read.go:479 +0x10aa
encoding/xml.(*Decoder).DecodeElement(0xc4201f3a20, 0x286500, 0xc42020cb70, 0x0, 0xc420362a01, 0x7c0078)
	/usr/local/Cellar/go/1.7.3/libexec/src/encoding/xml/read.go:133 +0x10b
encoding/xml.(*Decoder).Decode(0xc4201f3a20, 0x286500, 0xc42020cb70, 0xc420051d40, 0xc420322401)
	/usr/local/Cellar/go/1.7.3/libexec/src/encoding/xml/read.go:121 +0x48
encoding/xml.Unmarshal(0xc420362a00, 0x13bd, 0x1500, 0x286500, 0xc42020cb70, 0x1500, 0x0)
	/usr/local/Cellar/go/1.7.3/libexec/src/encoding/xml/read.go:115 +0x1c3
github.com/ianr0bkny/go-sonos/upnp.(*AVTransport).HandleProperty(0xc42020cb70, 0xc4201faa90, 0xc42034c000, 0x189c, 0xc420074a20, 0x7d801, 0x18)
	/Users/dsully/dev/sonos-go-tools/vendor/src/github.com/ianr0bkny/go-sonos/upnp/AVTransport.go:132 +0x1c9
github.com/ianr0bkny/go-sonos/upnp.(*upnpDefaultReactor).maybePostEvent(0xc420074900, 0xc420322390)
	/Users/dsully/dev/sonos-go-tools/vendor/src/github.com/ianr0bkny/go-sonos/upnp/event.go:203 +0xe6
github.com/ianr0bkny/go-sonos/upnp.(*upnpDefaultReactor).run(0xc420074900)
	/Users/dsully/dev/sonos-go-tools/vendor/src/github.com/ianr0bkny/go-sonos/upnp/event.go:218 +0x126
created by github.com/ianr0bkny/go-sonos/upnp.(*upnpDefaultReactor).Init
	/Users/dsully/dev/sonos-go-tools/vendor/src/github.com/ianr0bkny/go-sonos/upnp/event.go:151 +0x359

If I comment out:

xml.Unmarshal([]byte(doc.LastChange), &this.AVTransportState.LastChange)

upnp/AVTransport.go line 132, the code continues. I'm not familiar enough with golang to understand fully what's going on here.