Unable to clone input data at port 1 (Weka model): null

I’m traying to develop a new knime node, that use a weka J48 implemntation. When i try to use weka predictor i’m getting this error “Unable to clone input data at port 1 (Weka model): null”
help me please

Hi @Lisandra_Bravo,
how did you integrate with the weka integration, did you implement the required extension points? Are you able to share you project with us so that we can take a look? Did you try setting a breakpoint on the NullPointer exception to see where the exception it thrown? (see here for an explanation on how to this.).


thank you very much, the problem was simpler, were not properly serializing classes.

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