JSON Error? - Unfolding library - Bug or something else?

While trying to make use of GeoJSONReader from the Unfolding Library, while compiling I got the following error:

A JSONObject text must begin with '{'
JSON Error: Expected a ':' after a key
org.json.JSONException: Expected a ',' or '}' at 28 [character 29 line 1]
    at org.json.JSONTokener.syntaxError(Unknown Source)
    at org.json.JSONObject.<init>(Unknown Source)
    at org.json.JSONObject.<init>(Unknown Source)
    at de.fhpotsdam.unfolding.data.GeoJSONReader.loadDataFromJSON(Unknown Source)
....
A JSONObject text must end with '}'
JSONObject["features"] not found.
JSONObject["features"] is not a JSONArray.
Exception in thread "Animation Thread" java.lang.RuntimeException: java.lang.NullPointerException

And it goes on…
First, I thought it had to do with the JSON itself so I tested via several JSON web validators and it looked fine. I even compared it to another JSON that I knew was working when I used it. And actually,there is no problem with it as it can be displayed on geojson.io, as in the SS.

Now, I’m not sure whether I did something wrong but I’m pretty sure this is the way to load up a GeoJSON/JSON.

List<Feature> busLine = GeoJSONReader.loadDataFromJSON(this, "mures/linia4_linie.geo.json");

Link to the json gist

Any ideas?

Specs: using Unfolding library from here in Eclipse Mars, JDK 1.8.0_91

I’ve used it more than several times already but never had this issue before.