failed to build reference: exit status 1
cannot find package "1000-1999/1600-1699/1660-1669/1666/1666J.go" in any of:
	/usr/local/go/src/1000-1999/1600-1699/1660-1669/1666/1666J.go (from $GOROOT)
	/go/src/1000-1999/1600-1699/1660-1669/1666/1666J.go (from $GOPATH)