And for those getting this error:
Be sure to update all your core files, update the lib folder contents, and update the index.htm.
* @dir img/system/
* @type file

Zanto.Scene_Boot_prototype_create = Scene_Boot.prototype.create;
Scene_Boot.prototype.create = function() {
Zanto.Scene_Boot_prototype_create.call(this);
Graphics.loadFont('GameFontNumber', 'fonts/Braciola MS.ttf');
Graphics.loadFont('GameFontNumber2', 'fonts/DECTERM.ttf');
};