When you receive the error "Custom Specific Name could not be found" while uploading an Excel file, you have product attributes in your file that haven't been added to your Solid Commerce account yet.
To resolve the error:
1) In your Solid Commerce account, go to the Products menu -> Manage Product Attributes.
2) Add any attributes that are in your file, but not in Solid Commerce, to the Global Product Attributes pop-up.
- For instructions for adding product attributes, please see Creating and Using Custom Product Attributes.
3) If the attributes in Excel already exist in your Solid Commerce account, ensure that there are no typos or extra spaces in their names. The names in Excel must match your Solid Commerce account exactly.