Tony E, Take the clutch cover off (whole thing) look at the shift star, (it has the pins on it) there is a ratchet that moves the gears back and forth, the ratchet should be catching the pins, yours is probably off and is stuck on the outside of the pins. Just use a screwdriver to "pop" it back into place. This is more than likely to happen again after it happens once. I usually replace the shift rod ,detent, and spring to solve the problem. Parts are not that expensive, maybe $40 for everything. Hope this helps you out!