Lunar Revel Shop Error

I have already bought two out of the total offers that my Lunar Revel Shop has offered me and now I want to buy the Gentleman Gnar Skin which will include the Champion for me as well, for 780 RP, but when I try to buy it, I receive an error, that I haven't received on previous purchases from the Lunar Revel Shop. ''An unexpected error has occured. Please check back again later.'' I tried quitting and re-logging in, but the issue holds. It's been like this for two days. What's wrong?
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