Usually, a file processing error occurs when there is something amiss with the template formatting as opposed to errors on specific SKUs.
Prior to reaching out to Enterprise Operations, please check the following common file errors:
Is your file a CSV or Excel? If it is an Excel file, is the tab with your data properly titled as Listing Details?
Is your CSV file less than 16 MB? Is your Excel file less than 6 MB?
Do you have two header rows at the top of your data file, in the same order as the template?
Are your column headers titled exactly as they are in the template (case sensitive)?
If all of the above criteria is met, please contact the Enterprise Operations team for support, and we can unstick your file.