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Text vectorisation operator

AlexpayneAlexpayne Member Posts: 2 Newbie

My Text Vectorisation operator is asking me to specify at attribute, but the drop down menu is blank. It seems the data might not be pulling through, but I cannot understand why not or what the bottleneck might be. I think I am setting all the previous operators correctly (Select Attributes (All), Nominal to Text (Single > Message") and Set Role  (Category > Label)) and then I have a bundle of process operators (Tokenize > Stem Porter > Transform Cases > FilterStopwords) but they are allset to their defaults. 

What am I doing wrong? Many thanks. 

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