Question: I got an error "Empty barcode list supplied" when importing a category CSV file into Loupe Cell Browser. The barcodes are correct.
Answer: This error is typically associated with hidden characters such as carriage returns in the CSV file. Loupe Cell Browser requires that files are in plain CSV format.
If you are working in Excel, please ensure that you save the file in plain CSV format.
To remove carriage returns on the Bash shell, please try:
tr '\r' '\n' < category.csv > category.fixed.csv
In general, the solution is to replace each carriage return (\r or ^M) character with a Unix new-line character (\n).