This site is really just about mutliboxing. Documentation about HotKeyNet for other uses is still maintained on the HotKeyNet website. You can also find archived discussions on the old HotKeyNet forum, which while no longer active, were left up as a means of further documentation.
That said, I can try to help from a very limited, multiboxer only PoV.
HotKeyNet is telling you that you don't have a window called Book1 open or running anywhere on the assigned PC. You need to assign the names of the windows before you can expect HKN to find it, which is normally done via Rename command at the start of the script.
This is especially important in situations where the window names can change. For example, I can open Notepad++, the window isn't called Notepad++, it's called "new 1 - Notepad++ [Administrator]" I open another file, the whole window is now called "new 2...etc" or I open a named file, the window now becomes "the file's path\filename - Notepad++ [Administator]" and so on.
Or in situations like we as multiboxers see, where several windows have the same name and HKN needs a way to distinguish the different windows reliably.
So we need to tell HotKeyNet to assign a standard name for any window it needs to interact with so that it knows where to find things every time. When you restarted your PCs it sounds like the window you brought up the next time around was no longer called "Book1."
I don't know if you have a rename setup in your script since you only posted a single hotkey, but that is where you'll need to start.
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