openHMIS module's settings page error

This PR is now merged in! Apologies for the delay. Thanks

Andrew

I came across this error after clicking payment process button…I need help in this regard.

"An error occurred during the request.

[status on class org.openmrs.module.openhmis.cashier.api.model.Bill]

Code: org.openmrs.module.webservices.rest.web.resource.impl.BaseDelegatingResource:789

org.openmrs.module.webservices.rest.web.response.ConversionException: status on class org.openmrs.module.openhmis.cashier.api.model.Bill"