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BLOB is not a valid UTF-8 string error on CSV Load

I have a class that is loading a csv file and processing it through the system to update opportunity records. 


Most of the time, I have no problem with the csv files that we are using to run the updates, however, every so often one comes through that returns a "BLOB is not a valid UTF-8 string" error. I can't find the issue that is causing this - 


any ideas? 






Could you please on such record from your csv file which is causing this issue.