We are unable to process this item because of missing information. For more details, see http://sellercentral.amazon.ca/gp/help/23051
This error occurs when your file is missing required information. If you are using a text-file to manage your data, some columns in your spreadsheet are required. You will find these outlined on the Data Definitions tab of your template. If you are using XML feeds to manage your data, then the data for each product, order item, or order must conform to standard Amazon.ca requirements.
To avoid repeating this error, you should try the following steps: