where are you getting this error? can you post a screenshot?
w = white to move
KQkq = those are castling rights (Kingside white, Queenside white, kingside black, queenside black)
0 1 = move counts - you can remove them
Making a FEN
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I tried to create a FEN string after clicking the lil board on the post but get the error "TypeError: this.z7834f.za429c.cs is undefined." Essentially I don't understand the "w KQkq - 0 1" after the string. What is that?