Module is not available, misspelled or forgot to load (but I didn't)

It should be

var app = angular.module("MesaViewer", []);

This is the syntax you need to define a module and you need the array to show it has no dependencies.

You use the

angular.module("MesaViewer");

syntax when you are referencing a module you've already defined.

You are improperly declaring your main module, it requires a second dependencies array argument when creating a module, otherwise it is a reference to an existing module

Change:

var app = angular.module("MesaViewer");

To:

var app = angular.module("MesaViewer",[]);

Working Version

I had the same error and fixed it. It turned out to be a silly reason.

This was the culprit: <script src="app.js"/>

Fix: <script src="app.js"></script>

Make sure your script tag is ended properly!