Conflicting setter definitions for property Exception

I get the following error whenever I attempt to return an object from my controller

 Caused by: java.lang.RuntimeException: java.lang.IllegalArgumentException: Conflicting setter definitions for property \"active\": ca.uhn.fhir.model.dstu2.resource.Patient#setActive(1 params) vs ca.uhn.fhir.model.dstu2.resource.Patient#setActive(1 params)
    Caused by: java.lang.IllegalArgumentException: Conflicting setter definitions for property \"active\": ca.uhn.fhir.model.dstu2.resource.Patient#setActive(1 params) vs ca.uhn.fhir.model.dstu2.resource.Patient#setActive(1 params)"}}
DEBUG: org.hibernate.validator.internal.engine.resolver.DefaultTraversableResolver - Found javax.persistence.Persistence on classpath containing 'getPersistenceUtil'. Assuming JPA 2 environment. Trying to instantiate JPA aware TraversableResolver
DEBUG: org.hibernate.validator.internal.engine.resolver.DefaultTraversableResolver - Instantiated JPA aware TraversableResolver of type org.hibernate.validator.internal.engine.resolver.JPATraversableResolver.
DEBUG: org.hibernate.validator.internal.xml.ValidationXmlParser - Trying to load META-INF/validation.xml for XML based Validator configuration.

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The Controller code is as shown below:

	@ResponseStatus(HttpStatus.OK)
	@RequestMapping(value = "/fhir/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
	@ApiOperation(tags = "Fhir Patients Information", httpMethod = "GET", value = "Get Fhir Patient Information", notes = "Get Fhir Patient Information.")
	public FhirPatient getFhirPatientInfo(@PathVariable("id") long id) throws Exception {
		
		Patient patient = patientDAO.findPatientById(123708L);
		FhirPatient fhirPatient = FhirConverter.transformPatientToFhirPatient(patient);
		return fhirPatient;

	}

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The FhirConverter code is as shown below

    public static FhirPatient getFhirPatientFromPatient(Patient patient){
        FhirPatient fhirPatient = new FhirPatient();
        
        // Add an MRN (a patient identifier)
        IdentifierDt id = fhirPatient.addIdentifier();
        id.setValue(patient.getPatientId().toString());
        id.setUse(IdentifierUseEnum.OFFICIAL);
        
        // Add a name
        HumanNameDt name = fhirPatient.addName();
        name.setUse(NameUseEnum.OFFICIAL);
        name.addFamily(patient.getLastName());
        name.addGiven(patient.getFirstName()).addGiven(patient.getMiddleName());
}

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The Fhir object is created as follows:

package com.entity.fhir;


import java.util.Date;

import ca.uhn.fhir.model.dstu2.resource.Patient;
import ca.uhn.fhir.model.primitive.BooleanDt;



public class FhirPatient extends Patient implements java.io.Serializable{


              /**
               * 
               */
	      private static final long serialVersionUID = 1L;
	
	
	      private Integer pcpId;
              private Date dateOfBirth;
              private Integer maritialStatus;
              private Integer officeId;
              private Integer practiceId;



              
              public Integer getPcpId() {
                             return this.pcpId;
              }

              public void setPcpId(Integer pcpId) {
                             this.pcpId = pcpId;
              }

              
              public Date getDateOfBirth() {
                             return this.dateOfBirth;
              }
              
              public void setDateOfBirth(Date dateOfBirth) {
                             this.dateOfBirth = dateOfBirth;
              }
              
              public Integer getMaritialStatus() {
                             return this.maritialStatus;
              }

              public void setMaritialStatus(Integer maritialStatus) {
                             this.maritialStatus = maritialStatus;
              }
              
              public Integer getOfficeId() {
                             return officeId;
              }
              public void setOfficeId(Integer officeId) {
                             this.officeId = officeId;
              }
              
              public Integer getPracticeId() {
                             return practiceId;
              }
              public void setPracticeId(Integer practiceId) {
                             this.practiceId = practiceId;
              }
              

              
}

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Can you see any reason why when the controller method, when accessed via Swagger, throws this error