The CSV Synchronization Editor Gives an error: "An item with the same key has already been added." (4347209)

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Title

The CSV Synchronization Editor Gives an error: "An item with the same key has already been added."
Description

While using the CSV synchronization editor to load a CSV file, the editor gives the error, "An item with the same key has already been added."

What is the cause of this error and is there a solution?
Resolution

In the definition of the CSV schema file the Text wrap character is set to " (double quotes) as this was the chosen method by the creator of the CSV file to wrap the comma in the header that is also the delimiter. This can be detected by looking at the header.

Run the wizard to create the system connection again and update the "Text wrap character":