Docs
Resolving “the column () appears more than once in the file” error while performing bulk operations.
Solution
The error can occur because of the application used to create the import CSV file. Certain spreadsheet applications seem to save an extra column at the end, along with the empty columns. It is recommended to upload your file in Google sheets and verify if there are any additional columns added due to the spreadsheet application previously used, remove it and then upload it into Chargebee.
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