I would recommend going through some of the basic RapidMiner tutorials. This error occurs when you have not used the Set Role operator to define the target variable for your machine learning algorithm.
Brian T. Lindon Ventures Data Science Consulting from Certified RapidMiner Experts
Learner I
Answers
This error occurs when you have not used the Set Role operator to define the target variable for your machine learning algorithm.
Lindon Ventures
Data Science Consulting from Certified RapidMiner Experts