Hi KNIME team and community,
I’m encountering a critical issue where the configuration dialog of the Random Forest Learner node fails to open in a basic classification task using the Titanic dataset.
Problem:
When I double-click the node or try to open the configuration, I get the following error:
・The dialog cannot be opened: No possible target in input (node not connected)
This happens despite the node being connected to a properly executed
Partitioning node, and the input data including a valid target column.
Details about the target column Survived:
- Data type:
Integer(0/1) - No missing values
- Appears correctly in Table Output
- Created from scratch (even via Rule Engine / String Manipulation)
What I have already tried:
- Using
Double to IntonSurvived - Applying
Column Auto Type Cast - Using
Domain Calculatorto enforce nominal domain - Re-creating the column using
String→Rule Engine - Preprocessing externally (in Excel) before reading into KNIME
- Creating a new workflow with only:
CSV Reader → Partitioning → Random Forest Learner
→ Same error every time.
Other Observations:
Random Forest Regressionworks fine (dialog opens)Decision Tree Learnersometimes works- The error occurs regardless of feature columns (even when using only
SexandSurvived)
Questions:
- Is this a known issue or bug?
- How can I force the dialog to open or validate the node’s expected input schema?
- How does the Random Forest Learner internally check target eligibility?
I would really appreciate any insights. Thank you in advance!
