I looked at an instruction manual,
http://www.cameramanuals.org/voigtlander_pdf/voigtlander_bessa_i.pdf
Open the film window and turn the wind knob, do you see the backing paper moving?
Open the camera in total darkness and rewind the film on the supply spool.
Backing paper not moving when the wind knob is turned, reload the film turning the tongue of the paper opposite the direction of wind, wind until the paper coming in overlaps the tongue, position the start arrows, close the back and wind to frame 1. If the shutter is still locked out remove the film in total darkness and rewind onto the supply spool and secure with tape or a rubberband.
Paper moving, shutter not unlockimg- with the back open check the film path at the supply side and identify the wheel or mechanism that should turn when the film is advanced. Turn it by hand and see if the shutter unlocks. If the mechanism turns but the shutter does not unlock then the top cover will need to be removed to find the cause.