数组错误错误“无效的排名说明符：预期'，'或']”

I'm doing my homework. I am assigned to create a Tic Tac Toe application, I've finished it but there's a small error, and I think I'm overlooking something, but I can't figure it out and need some new eyes to check it out because I think I'm looking at it for too long and missing a big concept.I'm doing my homework. I am assigned to create