Couldn't find PersistentEntity error when using projections in spring data rest

Question

I am trying to use projection class in spring data rest repository method. But I am getting Couldn't find PersistentEntity error when trying to hit the endpoint. Not sure why its happening. Can someone please throw some light on it...

error

org.springframework.data.mapping.MappingException: Couldn't find PersistentEntity for type class com.bugfix.api.provider.entity.projections.IncidentLatestProjection!

Repo Class

public interface UpdatedIncidentRepository extends CrudRepository<UpdatedIncident, Integer> {
    
    
    @Query(" select new com.bugfix.api.provider.entity.projections.IncidentLatestProjection(" +
            "d.IncidentId,d.IncidentName,d.alm) from UpdatedIncident d" +
            " inner join Updatedparent u on u.parentId=d.parent.parentId where d.parent.parentId=:parentId ")

    List<IncidentLatestProjection> testing(@Param("parentId") Integer parentId);


}

Projection Class

@Data
@AllArgsConstructor
@NoArgsConstructor
public class IncidentLatestProjection {
    private Integer IncidentId;
    private String IncidentName;
    private String alm;



}

Entity Class

@Entity
@Table(name="Incident_v")
@NoArgsConstructor
@AllArgsConstructor
@Data
public class UpdatedIncident implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name="Incident_id")
    @JsonProperty("IncidentId")
    private Integer IncidentId;

    @Column(name="Incident_name")
    private String IncidentName;

    private String alm;

    //bi-directional many-to-one association to parent
    @ManyToOne
    @JoinColumn(name="parent_id")
    private Updatedparent parent;

}