Accidentally deleted skin on wot and now i cant play?

i just got a jagdpanther tank destroyer and i downloaded a skin for it. when i was trying to put it in the folder i accidentally deleted the original skin for the jp from the game and now when i try to play upon startup of the game it says updating vehicles with the little spinning gear but it never does anything..plz help if you know what to do...i havent even played the jp yet ;(