Take the oil fill cap off and look at the clutch from there. Does it move while you depress the clutch lever? Not unheard of for the assembly to "slip" out of place which won't allow the pressure plate to put pressure on the discs. Make sure the pressure plate is not too far toward the outside of the bike with no pressure on the lever. Some have been able to manipulate the parts back in place with a screwdriver. Start there and see what happens.