System failure. Gansu Food Electronic One-Ticket Service cannot be printed due to system failure. Electronic one-vote service refers to the Detailed Rules for the Implementation of Food Safety Traceability Management Measures in Gansu Province (for Trial Implementation) formulated and promulgated by the US Food and Drug Administration in Gansu on October 26th, 20 14, which requires medium-sized and above catering units and school canteens to fully establish electronic purchase ledgers, and encourages qualified small catering units to speed up the establishment and use of electronic traceability platforms.