ubuntu14.04(windows subsystem) panic: invalid argument

just copy and paste the simple json example2 in ubuntu14.04(windows subsystem)

al123xiaaaa@HASEE-PC:/jid$ ls -l total 3584 -rwxrwxrwx 1 al123xiaaaa al123xiaaaa 3044060 Dec 6 23:17 jid_linux_amd64 al123xiaaaa@HASEE-PC:/jid$ echo '{"info":{"date":"2016-10-23","version":1.0},"users":[{"name":"simeji","uri":"https://github.com/simeji","id":1},{"name":"simeji2","uri":"https://example.com/simeji","id":2},{"name":"simeji3","uri":"https://example.com/simeji3","id":3}],"userCount":3}}'| ./jid_linux_amd64 panic: invalid argument

goroutine 1 [running]: panic(0x514ee0, 0xc42000a7d0) /usr/local/Cellar/go/1.7.1/libexec/src/runtime/panic.go:500 +0x1a1 github.com/simeji/jid.(*Engine).Run(0xc4200b6000, 0x0, 0x0) /Users/ts/go/src/github.com/simeji/jid/engine.go:87 +0x7f3 main.run(0x5babe0, 0xc4200b6000, 0x534000, 0x1) /Users/ts/go/src/github.com/simeji/jid/cmd/jid/jid.go:36 +0x49 main.main() /Users/ts/go/src/github.com/simeji/jid/cmd/jid/jid.go:31 +0x10f