Unfortunately you did this in the wrong order to use a pruned blockchain. If you start by coping wallet.dat, it gets updated while downloading (and pruning) the blockchain.

If you get it to work, and after you've securely stored your Bitcoins in a different wallet, you'll own just over $400 in Forkcoins for every Bitcoin you had in 2013. It may be a nice little treasure hunt but don't do it before securing your Bitcoin.