不是你的文件没有被找到；它是一些名为 dssp 的可执行程序，它正在启动以处理您的文件.要么它不在您的 $PATH 上，要么根本没有安装 - 我对您使用的这个库一点也不熟悉，所以我不知道这里是否需要额外的安装步骤.

It's not your file that's not being found; it's some executable program called dssp that is being launched to process your file. Either it's not on your $PATH, or it's simply not installed at all - I am not at all familiar with this library you're using, so I have no idea if there's an additional installation step needed here.

如果你有这个程序，那么编辑 $PATH 的替代方法是向 DSSP() 构造函数添加一个 dssp= 参数，指定此程序的完整路径名.

If you do have the program, it appears than an alternative to editing your $PATH would be to add a dssp= parameter to the DSSP() constructor, specifying the full pathname to this program.