It turns out I saved my package to the wrong place while working in the Editor. I had to reimport everything, though since I was only running a test, it's okay.
I made my own package when I reimported everything, and it seems to have fixed the problem.
Thanks for helping out! If anyone who sees this thread is still having the problem, I can try and help out.
Hello. It occurred to me that this error comes up when you are making a map and have not saved it yet. It seems that UDK tries to save something to the 'autosave' directory which it can't, or that it tries to link to something it cannot find from within that directory.
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