Only one possible cause for that: the forks are jammed. When the lever is moved it acts on some forks inside the gearbox; these forks instead move some couplings than engage the respective gears. To prevent the accidental simultaneous engagement of 2 gears the gearbox has a blocking system - when one fork is engaged the others are locked disengaged with some balls and pins. In your case the blocking system has failed and has locked all forks in the disengaged position. The gearbox must be dismantled to access the blocking system for repairs - time to take the car to a repair shop.
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is there anyway I can smack the gearbox to release it?
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