This error could show when uploading spreadsheets for Products, Orders, Courier Prices, etc. If you are receiving this error (Invalid Spreadsheet Format: The conversion cannot be performed) when uploading a CSV file to Mintsoft this is caused by either a Non-Numeric Value in a Numeric Field (A space/ gap could also count as a non-numeric value) or a value missing from a field that is mandatory.
Examples of incorrect data in fields
SKU: (Blank) instead of SKU-123.
Quantity: One instead of 1.
Height: 10cm instead of 10.
If you have checked this and still seem to be getting the same error, please raise a new case online and reference the title of this article along with the CSV that is causing the issue and where it is being uploaded to.