问题是我只是将一些 pdf 文本复制到 Latex 文档中。幸运的是，编译器告诉我问题到底出在哪里。正如我上面提到的，这是一个元音变音。所以我只是重新输入它，仅此而已。
希望它能帮助某人。
I figured out what the error was.
The problem was that I just copied some pdf text into the Latex document. Luckily the compiler told me, where exactly the problem was. As I mentioned above it's an umlaut. So I just retyped it and that's it.
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我知道错误是什么了。
问题是我只是将一些 pdf 文本复制到 Latex 文档中。幸运的是，编译器告诉我问题到底出在哪里。正如我上面提到的，这是一个元音变音。所以我只是重新输入它，仅此而已。
希望它能帮助某人。
I figured out what the error was.
The problem was that I just copied some pdf text into the Latex document. Luckily the compiler told me, where exactly the problem was. As I mentioned above it's an umlaut. So I just retyped it and that's it.
Hope it helps someone.