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Telcontar120 Moderator, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,635
Unicorn
This is likely the artifact of characters that can't be encoded normally (like emojis or other similar graphical items) so you can simply filter them out using the "Filter Tokens" after you transform, or you can deal with them before you even process your document by using the Replace operator.5