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The "column reference is ambiguous" error message in Tableau for Mac means that there is more than one column in the data source with the same name or alias. This can cause confusion for Tableau when trying to execute a command or query, as it is not clear which column is being referred to. To resolve this error, you will need to clarify which specific column you are referring to by using its full name or by adjusting your data source to remove any duplicate column names or aliases.