Error 68 refers to the safety switch. Check the wiring and switch.
C016 refers to drive disabled, controller MP1510C
C0148 reverse pedal, switch error, zero position switch does not match signal reading. Check for broken or short circuit in signal line. Some of these error codes are almost useless when fault finding.
If you get a chance to view the fault as it happens, look at the traction controller, there should be a 7 segment display. Make a note of which segments are lit. You can contact me direct by email, see my profile