Serializable 추가

src/main/java/com/rest/api/entity/common/CommonDateEntity.java

@@ -7,12 +7,13 @@ import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 
 import javax.persistence.EntityListeners;
 import javax.persistence.MappedSuperclass;
+import java.io.Serializable;
 import java.time.LocalDateTime;
 
 @Getter
 @MappedSuperclass
 @EntityListeners(AuditingEntityListener.class)
-public abstract class CommonDateEntity {
+public abstract class CommonDateEntity implements Serializable {
     @CreatedDate
     private LocalDateTime createdAt;
     @LastModifiedDate