Essentially, this code takes a file (which is a few paragraphs of text) and counts the amount of times each letter appears and prints it onto the console. While I've finished all the code in terms of calculation, I'm running into an exception. When I run this, it shows:Essentially, this code takes a file (which is a
阅读背景：
计算每个字母在文件中显示的次数
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