new clutch wont engage?

just installed new clutch & pressure plate w/ resurfaced flywheel… then now it’s having problems, was fine for about 1500 miles, but now when my friend was trying to shift hard into second, it sounded like it mis-shifted, then now no gears will engage…
there is pressure on the pedal, car revs fine, but sounds like something is spinning inside that normally doesnt spin…

any help?