I am using random forest to predict a field. i am using weka predictor(3.7) to predict the value and random forest (3.7) as learner. I have another dataset where i do not have target attribute. when am connecting the random forest to another weka predictor which is connected to the file am having the following error:
ERROR WekaPredictorNodeDialog Error loading model settings
ERROR 7) Execute failed: java.lang.IllegalArgumentException: Column name(s) not found: <field>
I just confirmed this as a bug, and have notified the development team. In the meantime you could instead try using the native KNIME nodes: ensemble learner and ensemble predictor, which are also implementations of a random forest.
The developers have fixed the bug which means that the weka random forest nodes will function correctly again in the next release.
This bug appears for all classification nodes other than randomforest in weka 3.7 integration insite of updates. Not in 3.6. Please fix it urgently.