Have you verified that you have the file referenced (the fusefs.kext)? I also have a load_fusefs and a couple other files in the same directory. Did you check the error log it mentions? It may provide clues. I haven't run into this error with my usage. Sounds like it may be more related to the MacFuse side though. Fulling uninstalling it would likely take a bit of hunting around the file system to ensure you got all the pieces from it.