anchor.diff:        headerUploaded['tags'].forEach((String tagUuid, HashMap tagData) {
           CartTag tag = CartModel.instance.tagList.find(tagUuid);
           if (tag == null) {
  -          throw new Exception('[CartPostHeader] Tag specified in header info not found: ${tagData}');
  +          throw new Exception('[CartPostHeader] Tag specified in header info not found: \n${tagData}');
           }
           tag.updated = timestamp;
           header.tags.addAll({ tag.uuid: tag });
  
positive.code: 
      CartCategory category = CartModel.instance.categoryList.find(headerUploaded['category']['uuid']);
      if (category == null) {
        throw new Exception('[CartPostHeader] Category specified in header info not found: ${headerUploaded['category']}');
      }
      category.updated = timestamp;
      header.category = category;
  
negative.code:       headerUploaded['attachments'].forEach((String attachUuid, HashMap attachData) {
          CartPostAttachment attachment = new CartPostAttachment.fromJson(attachData);
          if (!(new File(LibPath.join(CartConst.WWW_POST_PUB_PATH, uuid, attachment.title))).existsSync()) {
            throw new Exception('[CartPostHeader] Attachment specified in header info not found: \n${attachData}');
          }
          header.attachments.addAll({ attachment.uuid: attachment });
        });
  