The guestbook Dpckerfile is giving this error when we try to build.

[stage-0 2/5] RUN go get github.com/codegangsta/negroni github.com/gorilla/mux github.com/xyproto/simpleredis/v2:
4.861 # github.com/gorilla/mux
4.861 src/github.com/gorilla/mux/route.go:28:15: undefined: any