如果该文件没有找到或者不可读，AppConfig将会默认地打印一个警告信息，程序还是会继续运行。

If the file can't be found or read, AppConfig will print a warning by default but the program will go on.

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如果没有找到属性集文件，消息键会使用它本身。

If no properties file is found, the key itself is used.

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ENOENT：没有找到这样的文件，或者指定的路径名不存在。

ENOENT — No such file was found or the specified path name doesn't exist.

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