Final answer:
The cashier should attempt to resolve the error using the information available at the register.
Step-by-step explanation:
In this situation, the cashier should attempt to resolve the error using the information available at the register. The information at the register is specifically provided to help in situations like this. The cashier should try to understand the error message and follow the instructions or troubleshoot the issue based on the available information.
Waiting for the manager or ignoring the error message may lead to delays in completing the transaction and may not address the issue at hand. Calling for technical support should be considered if the cashier is unable to resolve the error on their own, but it should be the last resort after attempting to resolve it using the available information.