Can't read file
If this happens when starting up WordSmith Tools, there is probably a component file missing. One example is sayings.txt, which holds sayings that appear in the main Controller window. If you've deleted it, I suggest you use notepad to start a new sayings.txt and put one blank line in it.
If you get this message at another time, something has gone wrong with a disk reading operation. The file you're trying to read in may be corrupted. This happens easily if you often handle very large files. See your Windows manual for help on fragmentation.