The error is more than likely caused by extra columns being added to the CSV file.
For example if the first Row is not the actual column Headers and says something like Table 1, this could be causing the error.
To get the file to Validate or process correctly, remove the unnecessary columns from the CSV file and then resubmit.
Be sure to also check the column Headers to ensure there are no commas in the Headers, if there is, that may also produce the error.
Steps to DuplicateCore > Settings > Data > Data Import
Click Add Job
Click Choose File
Select the File
Click Save & Exit
The following Error displays "Invalid file layout. Your file does not match one of the supported file layouts"