app.min.js:5 Uncaught ReferenceError: _ is not defined

[john1726]

Thank you for helping me get the "esprima-six" issue sorted out! Now, after setting everything up according to the readme and install files, this is the error I'm receiving:

app.min.js:5 Uncaught ReferenceError: _ is not defined

When I unminify app.min.js, this is the error:

app.js:1121 Uncaught ReferenceError: _ is not defined

Which points to this line of code:

return window.events = _.clone(Backbone.Events)

So, why is it not picking up underscore?

Does anyone have any suggestions? TIA.