在Java中，为什么我会收到一条错误消息，说我需要其他if？

So I have this huge project due within 6 hours, and although I haven't coded all the files that will be read I'm setting up all of the if statements. You see I'm making a database where the user types in 3 numbers, and in return will get a file read as out put. Everything seems fine thus far except for this one else shown at the bottom:So I have this huge project due within 6 hours,