How to build and deploy?

I am following this forum to deploy

So

/Users/seb/spark/ $ meteor build --directory /Users/seb/spark/spark-build

Returns

Supply the server hostname and port in the --server option for mobile app builds.

Also the spark-build directory does not appear?

DO you have IOS or android platforms on you app

if you do removed it with

meteor remove-platform ios
meteor remove-platform android

Let me know if it helps