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Answers
This is probably a problem with your CSV file.
Either a column that was identified as numeric contains the text BLUE in one line, or (more likely) the columns are not identified correctly. For example, you could have the separator character in the Description field.
Try importing with a different program (e. g. Excel) and check if everything is fine. Or override the automatic detection and import everything as nominal attributes in RapidMiner, then you'll be able to check where the wrong data are. It might be necessary to edit your CSV file so it can be imported correctly.
Regards,
Balázs