error while saving Patient

Hello Team Got error while saving patient details in openmrs AWS ec2 instance pls help in resolving

Did you install the 2.x Reference Application? If yes, then use the Register a patient button on the home page. It should look like this: https://demo.openmrs.org/openmrs/registrationapp/registerPatient.page?appId=referenceapplication.registrationapp.registerPatient