Cannot map index of nominal attribute to nominal value

Mo1Mo1 Member Posts: 7 Contributor I
edited November 2018 in Help


while preprocessing a Textmining operation i got the following problem : 
bug3.JPGbug 2 26.10.JPG

could someone please help me? 

i didn´t set up the process. Actually it is a University-course and the Professor gave us the processes. 

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