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

Node Development
1

Hi:
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

2

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.).

best,
Gabriel

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

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