"Muse Sampler library not found."

I was writing earlier, and my muse sounds were working. I saved and exited the program and turned off my computer. When I got back on the song I was working on, All the sounds were changed to MS Basic. I have no clue why it's doing this, and I have tried EVERYTHING to fix it. It says that the MuseSamplerCorelib.dll file is still where it is usually at. I need help desperately.