An internal error occurred. Please resubmit your data.
This error may be the result of an invalid fulfillment date in your feed. The fulfillment date must be between the date the order was placed and the date you submit the fulfillment file to Amazon.
If you are using XML, this error often occurs because the time zone is set incorrectly on the computer used for creating and submitting fulfillment files. When the computer is set to the wrong time zone, or does not account for Daylight Saving Time, it can appear as if the orders will be fulfilled in the future.
If the fulfillment date on your feed is correct, this error may be the result of an internal Amazon error. Please resubmit your data. If this error persists, please contact Seller Support.