anchor.diff:  
       CartCategory category = CartModel.instance.categoryList.find(headerUploaded['category']['uuid']);
       if (category == null) {
  -      throw new Exception('[CartPostHeader] Category specified in header info not found: ${headerUploaded['category']}');
  +      throw new Exception('[CartPostHeader] Category specified in header info not found: \n${headerUploaded['category']}');
       }
       category.updated = timestamp;
       header.category = category;
  
positive.code:       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}');
          }
          tag.updated = timestamp;
          header.tags.addAll({ tag.uuid: tag });
  
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 });
        });
  