Expression Error in the sample file query

[Anonymous]

Hi,

My query returns this after previously:

An error occurred in the ‘Sample File’ query. Expression.Error: There weren't enough elements in the enumeration to complete the operation.
Details:
Table

The query fetches 2 csv files from a folder. But now suddenly this appears. How to fix this?

Thanks!

[Nolock]

Hi @Anonymous,

please check that all column names are unique. It looks like you have at least one column name twice in your file.

If it isn't your case, please post a sample of your data and your Power Query query.