Whether its in the 'Your Music' category or its on the 'Main' category the "This song is not available. If you have the file on your comptuter you can import it." popup shows itself. I have used spotify for a long time and this now randomly happens. All photos/album covers etc are showing, but every time I press play it just stops instantly and shows the error sign.

I am paying for a subscription and its been 4 days that my computer cannot play any music from spotify. It obviously works on my phone so there is a clear problem with my desktop and spotify. I need this to be resolved because this is clearly not worth paying for if I have to constantly fix problems.