Cannot play song on PC but can play on IOS

[albinz]

Okay I dont know were the problem is atm but all I know is that local files has been broken for quite som time so I guess it has something to do with that.
Anyway, a couple of songs I just got added to my PC got synced into the loval files tab as they should but I cannot play them. a small error message flashes but disappers before even have a chance of trying to read it and then spotify starts playing a different song. Not a single song that I added is working. But when I later tried on my iphone 6 I can play those songs on there without any problem.
So thats up with all this? In my books it should be the other way around, it should have no trouble playing on my PC if they can play on my phone.
Please help me out here.