使用Angular JS将简单函数转换为工厂或服务时出错

I've searched SO and the web for a long time but still can't find the right answer to my problem. Although there are a lot of threads addressing function to Factory/Service conversion, none seem to apply to my current situation. I frequently use Services for setters/getters and $http calls without issue so I'm struggling to find out why I'm having so much trouble converting this simple function to a Factory or Service.I've searched SO and the web for a long time bu